1.
Geographic coordinate system
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A geographic coordinate system is a coordinate system used in geography that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are chosen such that one of the numbers represents a vertical position. A common choice of coordinates is latitude, longitude and elevation, to specify a location on a two-dimensional map requires a map projection. The invention of a coordinate system is generally credited to Eratosthenes of Cyrene. Ptolemy credited him with the adoption of longitude and latitude. Ptolemys 2nd-century Geography used the prime meridian but measured latitude from the equator instead. Mathematical cartography resumed in Europe following Maximus Planudes recovery of Ptolemys text a little before 1300, in 1884, the United States hosted the International Meridian Conference, attended by representatives from twenty-five nations. Twenty-two of them agreed to adopt the longitude of the Royal Observatory in Greenwich, the Dominican Republic voted against the motion, while France and Brazil abstained. France adopted Greenwich Mean Time in place of local determinations by the Paris Observatory in 1911, the latitude of a point on Earths surface is the angle between the equatorial plane and the straight line that passes through that point and through the center of the Earth. Lines joining points of the same latitude trace circles on the surface of Earth called parallels, as they are parallel to the equator, the north pole is 90° N, the south pole is 90° S. The 0° parallel of latitude is designated the equator, the plane of all geographic coordinate systems. The equator divides the globe into Northern and Southern Hemispheres, the longitude of a point on Earths surface is the angle east or west of a reference meridian to another meridian that passes through that point. All meridians are halves of great ellipses, which converge at the north and south poles, the prime meridian determines the proper Eastern and Western Hemispheres, although maps often divide these hemispheres further west in order to keep the Old World on a single side. The antipodal meridian of Greenwich is both 180°W and 180°E, the combination of these two components specifies the position of any location on the surface of Earth, without consideration of altitude or depth. The grid formed by lines of latitude and longitude is known as a graticule, the origin/zero point of this system is located in the Gulf of Guinea about 625 km south of Tema, Ghana. To completely specify a location of a feature on, in, or above Earth. Earth is not a sphere, but a shape approximating a biaxial ellipsoid. It is nearly spherical, but has an equatorial bulge making the radius at the equator about 0. 3% larger than the radius measured through the poles, the shorter axis approximately coincides with the axis of rotation
2.
Tokyo
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Tokyo, officially Tokyo Metropolis, is the capital of Japan and one of its 47 prefectures. The Greater Tokyo Area is the most populous area in the world. It is the seat of the Emperor of Japan and the Japanese government, Tokyo is in the Kantō region on the southeastern side of the main island Honshu and includes the Izu Islands and Ogasawara Islands. Formerly known as Edo, it has been the de facto seat of government since 1603 when Shogun Tokugawa Ieyasu made the city his headquarters. It officially became the capital after Emperor Meiji moved his seat to the city from the old capital of Kyoto in 1868, Tokyo Metropolis was formed in 1943 from the merger of the former Tokyo Prefecture and the city of Tokyo. The Tokyo metropolitan government administers the 23 Special Wards of Tokyo, the metropolitan government also administers 39 municipalities in the western part of the prefecture and the two outlying island chains. The population of the wards is over 9 million people. The prefecture is part of the worlds most populous metropolitan area with upwards of 37.8 million people, the city hosts 51 of the Fortune Global 500 companies, the highest number of any city in the world. Tokyo ranked third in the International Financial Centres Development IndexEdit, the city is also home to various television networks such as Fuji TV, Tokyo MX, TV Tokyo, TV Asahi, Nippon Television, NHK and the Tokyo Broadcasting System. Tokyo ranked first in the Global Economic Power Index and fourth in the Global Cities Index. The city is considered a world city – as listed by the GaWCs 2008 inventory – and in 2014. In 2015, Tokyo was named the Most Liveable City in the world by the magazine Monocle, the Michelin Guide has awarded Tokyo by far the most Michelin stars of any city in the world. Tokyo ranked first in the world in the Safe Cities Index, the 2016 edition of QS Best Student Cities ranked Tokyo as the 3rd-best city in the world to be a university student. Tokyo hosted the 1964 Summer Olympics, the 1979 G-7 summit, the 1986 G-7 summit, and the 1993 G-7 summit, and will host the 2020 Summer Olympics, Tokyo was originally known as Edo, which means estuary. During the early Meiji period, the city was also called Tōkei, some surviving official English documents use the spelling Tokei. However, this pronunciation is now obsolete, the name Tokyo was first suggested in 1813 in the book Kondō Hisaku, written by Satō Nobuhiro. When Ōkubo Toshimichi proposed the renaming to the government during the Meiji Restoration, according to Oda Kanshi, Tokyo was originally a small fishing village named Edo, in what was formerly part of the old Musashi Province. Edo was first fortified by the Edo clan, in the twelfth century
3.
Namazu (Japanese mythology)
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In Japanese mythology, the Namazu or Ōnamazu is a giant catfish who causes earthquakes. He lives in the mud under the islands of Japan, and is guarded by the god Kashima who restrains the catfish with a stone, when Kashima lets his guard fall, Namazu thrashes about, causing violent earthquakes. Following an earthquake near Edo in 1855, the Namazu became worshiped as a yonaoshi daimyōjin, namazu-e are a minor genre of ukiyo-e. They are usually unsigned and encompass a variety of scenes such as a namazu forcing the wealthy to excrete coins for the poor. It is believed by some that the origin of the story is the notion that catfish can sense the small tremors that happen before many earthquakes, supposedly, the sudden activity was observed in ancient times and people believed the quakes to be the result of a giant catfish. Catfish are depicted on pictures of emergency earthquake preparedness activities in Japan, for example, the Earthquake Early Warning logo by the Japan Meteorological Agency utilizes pictures of the catfish on devices capable of issuing an early warning. The popular earthquake early warning mobile application Yurekuru Call also has a catfish as their icon, Namazu is also the name of a song on Danish singer Oh Lands first studio album Fauna which features a large catfish on the album cover. The Pokémon Whiscash is originally named Namazun, resembles a catfish and has an earthquake as its signature move, an episode of the Pokémon anime featuring Whiscash was banned when it was scheduled to air too soon after a quake. The Namazu was featured in the episode of River Monsters, Cold-Blooded Horror, an image of a Namazu from a Tokyo site. Namazu-e, Earthquake catfish prints from the period after the Great Ansei Earthquake struck the city of Edo in November 1855
4.
Edo
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Edo, also romanized as Jedo, Yedo or Yeddo, is the former name of Tokyo. It was the seat of power for the Tokugawa shogunate, which ruled Japan from 1603 to 1868, during this period, it grew to become one of the largest cities in the world and home to an urban culture centered on the notion of a floating world. From the establishment of the Tokugawa bakufu headquarters at Edo, the became the de facto capital and center of political power. Edo grew from what had been a small, little-known fishing village in 1457 into the largest metropolis in the world with a population of 1,000,000 by 1721. Edo was repeatedly devastated by fires, with the Great Fire of Meireki in 1657 being the most disastrous, an estimated 100,000 people died in the fire. During the Edo period, there were about 100 fires mostly begun by accident, between 1600 and 1945, Edo/Tokyo was leveled every 25–50 years or so by fire, earthquakes, or war. In 1868, when the shogunate came to an end, the city was renamed Tokyo, the emperor moved his residence to Tokyo, making the city the formal capital of Japan, Keiō4, On the 17th day of the 7th month, Edo was renamed Tokyo. Keiō4, On the 27th day of the 8th month, Keiō4, On the eighth day of the ninth month, the nengō was formally changed from Keiō to Meiji and a general amnesty was granted. Meiji 2, On the 23rd day of the 10th month, ishimaru Sadatsuga was the magistrate of Edo in 1661. During the Edo period, the Shogunate appointed administrators with jurisdiction over the police, and beginning with the rule of Tokugawa Yoshimune), the machi bugyō heard criminal and civil suits, and performed other administrative functions. The city was out as a castle town around Edo Castle. Kyotos character was defined by the Imperial Court, the nobles, its Buddhist temples and its history, Osaka was the countrys commercial center. Areas further from the center were the domain of the chōnin, the area known as Shitamachi, northeast of the castle, was a center of urban culture. The ancient Buddhist temple of Sensō-ji still stands in Asakusa, marking the center of an area of traditional Shitamachi culture, some shops in the streets near the temple have existed continuously in the same location since the Edo period. The Sumida River, then called the Great River, ran along the edge of the city. The shogunates official rice-storage warehouses, other buildings and some of the citys best-known restaurants were located here. The Japan Bridge marked the center of the commercial center. Fishermen, craftsmen and other producers and retailers operated here, shippers managed ships known as tarubune to and from Osaka and other cities, bringing goods into the city or transferring them from sea routes to river barges or land routes such as the Tōkaidō
5.
Edo period
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The Edo period or Tokugawa period is the period between 1603 and 1868 in the history of Japan, when Japanese society was under the rule of the Tokugawa shogunate and the countrys 300 regional daimyō. The period was characterized by growth, strict social order, isolationist foreign policies. The shogunate was established in Edo on March 24,1603. The period came to an end with the Meiji Restoration on May 3,1868, instrumental in the rise of the new bakufu was Tokugawa Ieyasu, the main beneficiary of the achievements of Oda Nobunaga and Toyotomi Hideyoshi. Already powerful, Ieyasu profited by his transfer to the rich Kantō area, after Hideyoshis death, Ieyasu moved quickly to seize control from the Toyotomi family. Ieyasus victory over the western daimyōs at the Battle of Sekigahara gave him control of all Japan. He rapidly abolished numerous enemy daimyō houses, reduced others, such as that of the Toyotomi, Ieyasu still failed to achieve complete control of the western daimyōs, but his assumption of the title of shogun helped consolidate the alliance system. After further strengthening his base, Ieyasu installed his son Hidetada as shogun. The Toyotomi were still a significant threat, and Ieyasu devoted the next decade to their eradication, in 1615, the Tokugawa army destroyed the Toyotomi stronghold at Osaka. The Tokugawa period brought 250 years of stability to Japan, the political system evolved into what historians call bakuhan, a combination of the terms bakufu and han to describe the government and society of the period. In the bakuhan, the shogun had national authority and the daimyōs had regional authority and this represented a new unity in the feudal structure, which featured an increasingly large bureaucracy to administer the mixture of centralized and decentralized authorities. The feudal hierarchy was completed by the classes of daimyō. Closest to the Tokugawa house were the shinpan, or related houses and they were twenty-three daimyōs on the borders of Tokugawa lands, all directly related to Ieyasu. The shinpan held mostly honorary titles and advisory posts in the bakufu, the second class of the hierarchy were the fudai, or house daimyōs, rewarded with lands close to the Tokugawa holdings for their faithful service. By the 18th century,145 fudai controlled such smaller han, members of the fudai class staffed most of the major bakufu offices. Ninety-seven han formed the group, the tozama, former opponents or new allies. The tozama were located mostly on the peripheries of the archipelago, because the tozama were least trusted of the daimyō, they were the most cautiously managed and generously treated, although they were excluded from central government positions. The Tokugawa not only consolidated their control over a reunified Japan, they also had unprecedented power over the emperor, the court, all daimyōs and the religious orders
6.
Epicenter
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The term was coined by the Irish seismologist Robert Mallet. The word, however, is misused to mean center. In seismology, the epicenter is the point on the Earths surface directly above the point where the fault begins to rupture, however, in larger events, the length of the fault rupture is much longer, and damage can be spread across the rupture zone. During an earthquake seismic waves propagate spherically out from the hypocenter, outside of the seismic shadow zone both types of wave can be detected but, due to their different velocities and paths through the Earth, they arrive at different times. This distance is called the distance, commonly measured in °. Once epicentral distances have been calculated from at least three seismographic measuring stations, it is a matter to find out where the epicenter was located using trilateration. Epicentral distance is used in calculating seismic magnitudes developed by Richter. Epicenter is frequently misused when not employed in the context of seismology and it is often utilized as an alternative to centre. For example, Travel is restricted in the Chinese province thought to be the epicentre of the SARS outbreak, garners Modern American Usage gives several examples of such misuse. However, Garner notes that these misusages may be metaphorical uses of the term to describe focal points of unstable and potentially destructive environments
7.
Tsunami
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A tsunami or tidal wave, also known as a seismic sea wave, is a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean or a large lake. Unlike normal ocean waves which are generated by wind, or tides which are generated by the pull of the Moon and Sun. Tsunami waves do not resemble normal undersea currents or sea waves, Tsunamis generally consist of a series of waves with periods ranging from minutes to hours, arriving in a so-called internal wave train. Wave heights of tens of metres can be generated by large events, numerous terms are used in the English language to describe waves created in a body of water by the displacement of water, however, none of the terms in frequent use are entirely accurate. The term tsunami, meaning harbour wave in literal translation, comes from the Japanese 津波, while not entirely accurate, as tsunami are not restricted to harbours, tsunami is currently the term most widely accepted by geologists and oceanographers. Tsunami are sometimes referred to as tidal waves and this once-popular term derives from the most common appearance of tsunami, which is that of an extraordinarily high tidal bore. Although the meanings of tidal include resembling or having the form or character of the tides, use of the tidal wave is discouraged by geologists. The term seismic sea wave also is used to refer to the phenomenon, prior to the rise of the use of the term tsunami in English-speaking countries, scientists generally encouraged the use of the term seismic sea wave rather than tidal wave. The Sumatran region is not unused to tsunamis either, with earthquakes of varying magnitudes regularly occurring off the coast of the island, Tsunamis are an often underestimated hazard in the Mediterranean Sea and parts of Europe. The tsunami claimed more than 123,000 lives in Sicily, the Storegga Slide in the Norwegian sea and some examples of tsunamis affecting the British Isles refer to landslide and meteotsunamis predominantly and less to earthquake-induced waves. The cause, in my opinion, of this phenomenon must be sought in the earthquake, at the point where its shock has been the most violent the sea is driven back, and suddenly recoiling with redoubled force, causes the inundation. Without an earthquake I do not see how such an accident could happen, the principal generation mechanism of a tsunami is the displacement of a substantial volume of water or perturbation of the sea. This displacement of water is attributed to either earthquakes, landslides, volcanic eruptions, glacier calvings or more rarely by meteorites. The waves formed in this way are then sustained by gravity, tides do not play any part in the generation of tsunamis. Tsunami can be generated when the sea floor abruptly deforms and vertically displaces the overlying water and they grow in height when they reach shallower water, in a wave shoaling process described below. A tsunami can occur in any state and even at low tide can still inundate coastal areas. On April 1,1946, the 8.6 Mw Aleutian Islands earthquake occurred with a maximum Mercalli intensity of VI and it generated a tsunami which inundated Hilo on the island of Hawaii with a 14-metre high surge. Between 165 and 173 were killed, the area where the earthquake occurred is where the Pacific Ocean floor is subducting under Alaska
8.
Convergent boundary
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As a result of pressure, friction, and plate material melting in the mantle, earthquakes and volcanoes are common near convergent boundaries. When two plates move towards one another, they form either a subduction zone or a continental collision and this depends on the nature of the plates involved. In a subduction zone, the plate, which is normally a plate with oceanic crust, moves beneath the other plate. During collisions between two plates, large mountain ranges, such as the Himalayas are formed. The nature of a convergent boundary depends on the type of plates that are colliding, at an oceanic-continental convergent boundary, the oceanic lithosphere will always subduct below the continental lithosphere. This is caused by the density difference between the oceanic and continental lithosphere. This type of boundary is called a subduction zone. At the surface, the expression is commonly an oceanic trench which forms on the oceanic side. On the continental side, a chain of volcanoes forms above the location of the subducting plate, an example of a continental-oceanic subduction zone is the area along the western coast of South America where the oceanic Nazca Plate is being subducted beneath the continental South American Plate. A volcanic arc is formed on the plate, above the location of the downgoing oceanic slab. The volcanic arc is the expression of the magma that is generated by hydrous melting of the mantle above the downgoing slab. The buoyant fluids then rise into the asthenosphere, where they lower the temperature of the mantle. Either action will create extensive mountain ranges and it may have also pushed nearby parts of the Asian continent aside to the east. When two plates with oceanic crust converge, they create an island arc as one plate is subducted below the other. The arc is formed from volcanoes which erupt through the plate as the descending plate melts below it. The arc shape occurs because of the surface of the earth. A deep oceanic trench is located in front of such arcs where the descending slab dips downward, plates may collide at an oblique angle rather than head-on to each other, and this may cause strike-slip faulting along the collision zone, in addition to subduction or compression. Not all plate boundaries are easily defined, some are broad belts whose movements are unclear to scientists
9.
Subduction
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Subduction is a geological process that takes place at convergent boundaries of tectonic plates where one plate moves under another and is forced or sinks due to gravity into the mantle. Regions where this occurs are known as subduction zones. Rates of subduction are typically in centimeters per year, with the rate of convergence being approximately two to eight centimeters per year along most plate boundaries. Plates include both oceanic crust and continental crust, stable subduction zones involve the oceanic lithosphere of one plate sliding beneath the continental or oceanic lithosphere of another plate due to the higher density of the oceanic lithosphere. That is, the lithosphere is always oceanic while the overriding lithosphere may or may not be oceanic. Subduction zones are sites that have a rate of volcanism, earthquakes. Subduction zones are sites of convective downwelling of Earths lithosphere, subduction zones exist at convergent plate boundaries where one plate of oceanic lithosphere converges with another plate. The descending slab, the plate, is over-ridden by the leading edge of the other plate. The slab sinks at an angle of approximately twenty-five to forty-five degrees to Earths surface and this sinking is driven by the temperature difference between the subducting oceanic lithosphere and the surrounding mantle asthenosphere, as the colder oceanic lithosphere is, on average, denser. At a depth of approximately 80–120 kilometers, the basalt of the oceanic crust is converted to a rock called eclogite. At that point, the density of the oceanic crust increases and provides additional negative buoyancy and it is at subduction zones that Earths lithosphere, oceanic crust, sedimentary layers and some trapped water are recycled into the deep mantle. Earth is so far the only planet where subduction is known to occur, subduction is the driving force behind plate tectonics, and without it, plate tectonics could not occur. Subduction zones dive down into the mantle beneath 55,000 kilometers of convergent plate margins, subduction zones burrow deeply but are imperfectly camouflaged, and geophysics and geochemistry can be used to study them. Not surprisingly, the shallowest portions of subduction zones are known best, subduction zones are strongly asymmetric for the first several hundred kilometers of their descent. They start to go down at oceanic trenches and their descents are marked by inclined zones of earthquakes that dip away from the trench beneath the volcanoes and extend down to the 660-kilometer discontinuity. Subduction zones are defined by the array of earthquakes known as the Wadati–Benioff zone after the two scientists who first identified this distinctive aspect. Subduction zone earthquakes occur at greater depths than elsewhere on Earth, such deep earthquakes may be driven by deep phase transformations, thermal runaway, the subducting basalt and sediment are normally rich in hydrous minerals and clays. Additionally, large quantities of water are introduced into cracks and fractures created as the slab bends downward
10.
Pacific Plate
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The Pacific Plate is an oceanic tectonic plate that lies beneath the Pacific Ocean. At 103 million square kilometres, it is the largest tectonic plate, the Pacific Plate contains an interior hot spot forming the Hawaiian Islands. Hillis and Müller are reported to consider the Birds Head Plate to be moving in unison with the Pacific Plate, bird considers them to be unconnected. The north-eastern side is a divergent boundary with the Explorer Plate, the Juan de Fuca Plate and the Gorda Plate forming respectively the Explorer Ridge, the Juan de Fuca Ridge and the Gorda Ridge. In the middle of the side is a transform boundary with the North American Plate along the San Andreas Fault. The south-eastern side is a divergent boundary with the Nazca Plate forming the East Pacific Rise, the southern side is a divergent boundary with the Antarctic Plate forming the Pacific-Antarctic Ridge. The Alpine Fault marks a boundary between the two plates, and further south the Indo-Australian Plate subducts under the Pacific Plate forming the Puysegur Trench. The southern part of Zealandia, which is to the east of this boundary, is the plates largest block of continental crust, the northern side is a convergent boundary subducting under the North American Plate forming the Aleutian Trench and the corresponding Aleutian Islands. The Pacific Plate is almost entirely oceanic crust, but it contains some continental crust in New Zealand, Baja California, the Pacific Plate has the distinction of showing one of the largest areal sections of the oldest members of seabed geology being entrenched into eastern Asian oceanic trenches. The oldest member disappearing by way of the Plate Tectonics cycle is early-Cretaceous, all maps of the Earths ocean floor geology show ages younger than 145 million years, only about 1/30 of the Earths 4.55 billion year history
11.
Philippine Sea Plate
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The Philippine Sea Plate or Philippine Plate is a tectonic plate comprising oceanic lithosphere that lies beneath the Philippine Sea, to the east of the Philippines. Most segments of the Philippines, including northern Luzon, are part of the Philippine Mobile Belt, to the north, the Philippine Sea Plate meets the Okhotsk Plate at the Nankai Trough. The Philippine Sea Plate, the Amurian Plate, and the Okhotsk Plate meet at Mount Fuji in Japan, thickened crust of the Izu-Bonin-Mariana arc colliding with Japan constitutes the Izu Collision Zone. The eastern side of the Philippine Sea Plate is a convergent boundary with the Pacific Plate subducting at the Izu-Ogasawara Trench, the east of the plate includes the Izu-Ogasawara and the Mariana Islands, forming the Izu-Bonin-Mariana Arc system. There is also a divergent boundary between the Philippine Sea Plate and the small Mariana Plate which carries the Mariana Islands, to the south, the Philippine Sea Plate is bounded by the Caroline Plate and Birds Head Plate. To the west, the Philippine Sea Plate subducts under the Philippine Mobile Belt at the Philippine Trench, to the northwest the Philippine Sea Plate meets Taiwan and the Nansei islands on the Okinawa Plate, and southern Japan on the Amurian Plate. List of earthquakes in Guam List of earthquakes in Japan List of earthquakes in the Philippines Hall, Robert, Fuller, Michael, Ali, Jason R. Anderson, the Philippine Sea Plate Magnetism and Reconstructions. High resolution map of Tectonic Plate Boundaries Map showing Seismicity of the Earth, 1900‒2012, Philippine Sea Plate and Vicinity United States Geological Survey
12.
Eurasian Plate
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It also includes oceanic crust extending westward to the Mid-Atlantic Ridge and northward to the Gakkel Ridge. The eastern side is a boundary with the North American Plate to the north and a boundary with the Philippine Sea Plate to the south, and possibly with the Okhotsk Plate and the Amurian Plate. The southerly side is a boundary with the African Plate to the west, the Arabian Plate in the middle, the westerly side is a divergent boundary with the North American Plate forming the northernmost part of the Mid-Atlantic Ridge, which is straddled by Iceland. The geodynamics of central Asia is dominated by the interaction between the Eurasian and Indian Plates, in this area, many subplates or crust blocks have been recognized, which form the Central Asian and the East Asian transit zones
13.
North American Plate
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The North American Plate is a tectonic plate covering most of North America, Greenland, Cuba, the Bahamas, extreme northeastern Russia, and parts of Iceland and the Azores. It extends eastward to the Mid-Atlantic Ridge and westward to the Chersky Range in eastern Siberia, the plate includes both continental and oceanic crust. The interior of the continental landmass includes an extensive granitic core called a craton. Along most of the edges of this craton are fragments of material called terranes. It is thought that much of North America west of the Rocky Mountains is composed of such terranes, the parallel Septentrional and Enriquillo-Plantain Garden faults, which run through the island of Hispaniola and bound the Gonâve Microplate, are also a part of the boundary. On the northerly boundary is a continuation of the Mid-Atlantic ridge called the Gakkel Ridge, the rest of the boundary in the far northwestern part of the plate extends into Siberia. On its western edge, the Farallon Plate has been subducting under the North American Plate since the Jurassic Period, the Juan de Fuca, Explorer, Gorda, Rivera, Cocos and Nazca plates are remnants of the Farallon Plate. The boundary along the Gulf of California is complex and it is generally accepted that a piece of the North American Plate was broken off and transported north as the East Pacific Rise propagated northward, creating the Gulf of California. A few hotspots are thought to exist below the North American Plate, the most notable hotspots are the Yellowstone, Raton, and Anahim hotspots. The Yellowstone and Anahim hotspots are thought to have first arrived during the Miocene period and are still geologically active, for the most part, the North American Plate moves in roughly a southwest direction away from the Mid-Atlantic Ridge. One recent study suggests that a convective current is propelling the plate. Geologic timeline of Western North America New Madrid Seismic Zone - an ancient intraplate fault zone within the North American Plate, notable as early as 1699 Notes
14.
Izu-Bonin-Mariana Arc
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The Izu-Bonin-Mariana arc system is a tectonic-plate convergent boundary. The IBM arc system lies along the margin of the Philippine Sea Plate in the Western Pacific Ocean. It is most famous for being the site of the deepest gash in Earths solid surface, the IBM arc system formed as a result of subduction of the western Pacific plate. The IBM arc system now subducts mid-Jurassic to Early Cretaceous lithosphere, with younger lithosphere in the north and older lithosphere in the south, Subduction rates vary from ~2 cm per year in the south to 6 cm in the north. The IBM arc system is an excellent example of a convergent margin. IOCMs are built on oceanic crust and contrast fundamentally with island arc built on continental crust, because IOCMs are far removed from continents they are not affected by the large volume of alluvial and glacial sediments. The consequent thin sedimentary cover makes it easier to study arc infrastructure and determine the mass. Active hydrothermal systems found on the parts of IOCMs give us a chance to study how many of earths important ore deposits formed. Crust and lithosphere produced by the IBM arc system during its ~50 Ma history are found today as far west as the Kyushu-Palau Ridge, the IBM arc system is the surficial expression of the operation of a subduction zone and this defines its vertical extent. The intersection of the IBM, Japan, and Sagami trenches at the Boso Triple Junction is the only trench-trench-trench triple junction on Earth. The IBM arc system is bounded on the east by a deep trench. The southern boundary is found where the IBM Trench meets the Kyushu-Palau Ridge near Belau, thus defined, the IBM arc system spans over 25° of latitude, from 11°N to 35°20’N The IBM arc system is part of the Philippine Sea Plate, at least to the first approximation. The Philippine Sea Plate has four neighboring plates, Pacific, Eurasian, North American, there is minor relative motion between PH and CR, furthermore, CR does not feed the IBM Subduction Factory, so it is not discussed further. The North American plate includes northern Japan, but relative motion between it and Eurasia is sufficiently small that relative motion between PH and EU explains the motion of interest. The Euler pole for PH-PA as inferred from the NUVEL-1A model for current plate motions lies about 8°N137. 3°E, PA rotates around this pole CCW ~1°/Ma with respect to PH. This means that relative to the southernmost IBM, PA is moving NW and being subducted at about 20–30 mm/y, whereas relative to the northernmost IBM, PA is moving WNW and twice as fast. At the south end of IBM, there is almost now convergence between the Caroline Plate and the Philippine Sea Plate and it should be noted that the IBM arc is not experiencing trench ‘roll-back’, that is, the migration of the oceanic trench towards the ocean. The trench is moving towards Eurasia, although a strongly extensional regime is maintained in the IBM arc system because of rapid PH-EU convergence, the nearly vertical orientation of the subducted plate beneath southern IBM exerts a strong “sea-anchor” force that strongly resists its lateral motion
15.
Lithosphere
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A lithosphere is the rigid, outermost shell of a terrestrial-type planet or natural satellite that is defined by its rigid mechanical properties. On Earth, it is composed of the crust and the portion of the mantle that behaves elastically on time scales of thousands of years or greater. The outermost shell of a planet, the crust, is defined on the basis of its chemistry. Earths lithosphere includes the crust and the uppermost mantle, which constitute the hard, the lithosphere is subdivided into tectonic plates. The uppermost part of the lithosphere that chemically reacts to the atmosphere, hydrosphere and biosphere through the forming process is called the pedosphere. The lithosphere is underlain by the asthenosphere which is the weaker, hotter, the study of past and current formations of landscapes is called geomorphology. The concept of the lithosphere as Earth’s strong outer layer was described by A. E. H, love in his 1911 monograph Some problems of Geodynamics and further developed by Joseph Barrell, who wrote a series of papers about the concept and introduced the term lithosphere. The concept was based on the presence of significant gravity anomalies over continental crust and these ideas were expanded by Reginald Aldworth Daly in 1940 with his seminal work Strength and Structure of the Earth and have been broadly accepted by geologists and geophysicists. The temperature at which olivine begins to deform viscously is often used to set this isotherm because olivine is generally the weakest mineral in the upper mantle, the mantle part of the lithosphere consists largely of peridotite. The crust is distinguished from the mantle by the change in chemical composition that takes place at the Moho discontinuity. Oceanic lithosphere consists mainly of mafic crust and ultramafic mantle and is denser than continental lithosphere, oceanic lithosphere thickens as it ages and moves away from the mid-ocean ridge. This thickening occurs by conductive cooling, which converts hot asthenosphere into lithospheric mantle and causes the oceanic lithosphere to become increasingly thick, the thickness of the mantle part of the oceanic lithosphere can be approximated as a thermal boundary layer that thickens as the square root of time. H ∼2 κ t Here, h is the thickness of the mantle lithosphere, κ is the thermal diffusivity for silicate rocks. The age is equal to L/V, where L is the distance from the spreading centre of mid-oceanic ridge. Oceanic lithosphere is less dense than asthenosphere for a few tens of millions of years and this is because the chemically differentiated oceanic crust is lighter than asthenosphere, but thermal contraction of the mantle lithosphere makes it more dense than the asthenosphere. New oceanic lithosphere is constantly being produced at mid-ocean ridges and is recycled back to the mantle at subduction zones, geoscientists can directly study the nature of the subcontinental mantle by examining mantle xenoliths brought up in kimberlite, lamproite, and other volcanic pipes. The histories of these xenoliths have been investigated by many methods, such studies have confirmed that mantle lithospheres below some cratons have persisted for periods in excess of 3 billion years, despite the mantle flow that accompanies plate tectonics. Cryosphere Geosphere Kola Superdeep Borehole Plate tectonics Solid Earth Chernicoff, Stanley, Whitney, earths Crust, Lithosphere and Asthenosphere Crust and Lithosphere
16.
Aftershock
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An aftershock is a smaller earthquake that occurs after a previous large earthquake, in the same area of the main shock. If an aftershock is larger than the shock, the aftershock is redesignated as the main shock. Aftershocks are formed as the crust around the fault plane adjusts to the effects of the main shock. Typically, aftershocks are found up to an equal to the rupture length away from the fault plane. The pattern of aftershocks helps confirm the size of area that slipped during the main shock, Aftershocks rates and magnitudes follow several well-established empirical laws. The frequency of aftershocks decreases roughly with the reciprocal of time after the main shock and this empirical relation was first described by Fusakichi Omori in 1894 and is known as Omoris law. It is expressed as n = k where k and c are constants, a modified version of Omoris law, now commonly used, was proposed by Utsu in 1961. N = k p p is a third constant which modifies the decay rate. According to these equations, the rate of aftershocks decreases quickly with time, the rate of aftershocks is proportional to the inverse of time since the mainshock and this relationship can be used to estimate the probability of future aftershock occurrence. These patterns describe only the behavior of aftershocks, the actual times, numbers and locations of the aftershocks are stochastic. N =10 a − b M Where, N is the number of greater or equal to M M is magnitude a and b are constants In summary, there are more small aftershocks. Aftershocks are dangerous because they are unpredictable, can be of a large magnitude. An aftershock sequence is deemed to have ended when the rate of seismicity drops back to a background level, i. e. no further decay in the number of events with time can be detected. Land movement around the New Madrid is reported to be no more than 0.2 mm a year, Aftershocks on the San Andreas are now believed to top out at 10 years while earthquakes in New Madrid are considered aftershocks nearly 200 years after the 1812 New Madrid earthquake. Some scientists have tried to use foreshocks to help predict upcoming earthquakes, on the East Pacific Rise however, transform faults show quite predictable foreshock behaviour before the main seismic event. Reviews of data of past events and their foreshocks showed that they have a low number of aftershocks, seismologists use tools such as the Epidemic-Type Aftershock Sequence model to study cascading aftershocks. Following a large earthquake and aftershocks, many people have reported feeling phantom earthquakes when in fact no earthquake was taking place and this condition, known as earthquake sickness is thought to be related to motion sickness, and usually goes away as seismic activity tails off. Earthquake Aftershocks Not What They Seemed at Live Science
17.
Catfish
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Catfish are a diverse group of ray-finned fish. There are armour-plated types and there are also naked types, neither having scales, despite their name, not all catfish have prominent barbel. Members of the Siluriformes order are defined by features of the skull, Catfish are of considerable commercial importance, many of the larger species are farmed or fished for food. Many of the species, particularly the genus Corydoras, are important in the aquarium hobby. Many catfish are nocturnal, but others are crepuscular or diurnal, extant catfish species live inland or in coastal waters of every continent except Antarctica. Catfish have inhabited all continents at one time or another, Catfish are most diverse in tropical South America, Asia and Africa with one family native to North America and one family in Europe. More than half of all species live in the Americas. They are the only ostariophysans that have entered freshwater habitats in Madagascar, Australia and they are found in freshwater environments, though most inhabit shallow, running water. Representatives of at least eight families are hypogean with three families that are also troglobitic, one such species is Phreatobius cisternarum, known to live underground in phreatic habitats. Numerous species from the families Ariidae and Plotosidae, and a few species from among the Aspredinidae and Bagridae, are found in salt water. In the United States, catfish species may be known by a variety of names, such as mud cat, polliwogs. These nicknames are not standardized, so one area may call a bullhead catfish by the nickname chucklehead, while in state or region. Representatives of the genus Ictalurus have been introduced into European waters in the hope of obtaining a sporting, however, the European stock of American catfishes has not achieved the dimensions of these fish in their native waters, and have only increased the ecological pressure on native European fauna. Walking catfish have also introduced in the freshwaters of Florida. Flathead catfish, Pylodictis olivaris, is also a North American pest on Atlantic slope drainages, pterygoplichthys species, released by aquarium fishkeepers, have also established feral populations in many warm waters around the world. In general, they are buoyant, which means that they will usually sink rather than float due to a reduced gas bladder. Catfish have a variety of shapes, though most have a cylindrical body with a flattened ventrum to allow for benthic feeding. A flattened head allows for digging through the substrate as well as serving as a hydrofoil
18.
Amaterasu
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Amaterasu, Amaterasu-ōmikami or Ōhirume-no-muchi-no-kami is a part of the Japanese myth cycle and also a major deity of the Shinto religion. She is seen as the goddess of the sun, but also of the universe, the name Amaterasu derived from Amateru means shining in heaven. The meaning of her name, Amaterasu-ōmikami, is the great august kami who shines in the heaven. According to the Kojiki and Nihon Shoki in Japanese mythology, the Emperors of Japan are considered to be descendants of Amaterasu. Amaterasu appears to be the Japanese expression of a historical pan-Asiatic solar goddess, another possible expression is the Chinese Xihe. The oldest tales of Amaterasu come from the ca.712 A. D. Kojiki, Nihon Shoki, the oldest records of Japanese history. In Japanese mythology, Amaterasu, the goddess of the sun, is the sister of Susanoo, the god of storms and the sea, and of Tsukuyomi and it was written that Amaterasu had painted the landscape with her siblings to create ancient Japan. All three were born from Izanagi when he was purifying himself after entering Yomi, the underworld, Amaterasu was born when Izanagi washed out his left eye, Tsukuyomi was born from the washing of the right eye, and Susanoo from the washing of the nose. She became the ruler of the sun and the heavens along with her brother, Tsukuyomi, the god of the moon and ruler of the night. Originally, Amaterasu shared the sky with Tsukuyomi, her husband and brother until, out of disgust, he killed the goddess of food, Uke Mochi, when she pulled food from her rectum, nose, and mouth. This killing upset Amaterasu causing her to label Tsukuyomi an evil god and split away from him, the texts also tell of a long-standing rivalry between Amaterasu and her other brother, Susanoo. When he was to leave Heaven by orders of Izanagi, he went to bid his sister goodbye, Amaterasu was suspicious, but when Susanoo proposed a challenge to prove his sincerity, she accepted. Each of them took an object of the others and from it birthed gods, Amaterasu birthed three women from Susanoos sword while he birthed five men from her necklace. Claiming the gods were hers because they were born of her necklace, Amaterasu, who was in fury and grief, hid inside the Ama-no-Iwato, thus effectively hiding the sun for a long period of time. Though she was persuaded to leave the cave, Susanoo was punished by being banished from Heaven, both later amended their conflict when Susanoo gave her the Kusanagi-no-Tsurugi sword as a reconciliation gift. When they both reconciled the moon became visible, according to legend, Amaterasu bequeathed to her descendant Ninigi, the mirror, Yata no Kagami, the jewel, Yasakani no Magatama, and the sword, Kusanagi-no-Tsurugi. This sacred mirror, jewel, and sword collectively became the three Imperial Regalia of Japan, the Ise Shrine located in Ise, Honshū, Japan houses the inner shrine, Naiku, dedicated to Amaterasu. Her sacred mirror, Yata no Kagami, is said to be kept at this shrine as one of the Imperial Regalia of Japan, at this shrine, a ceremony known as Shikinen Sengu is held every 20 years to honor Amaterasu
19.
Matthew C. Perry
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Matthew Calbraith Perry was a Commodore of the United States Navy and commanded a number of ships. He served in wars, most notably in the Mexican–American War. He played a role in the opening of Japan to the West with the Convention of Kanagawa in 1854. Perry was very concerned with the education of officers and helped develop an apprentice system that helped establish the curriculum at the United States Naval Academy. With the advent of the engine, he became a leading advocate of modernizing the US Navy. Matthew Perry was the son of Sarah Wallace and Navy Captain Christopher R. Perry, Matthew Perry received a midshipmans warrent in the Navy in 1809, and was initially assigned to the USS Revenge, under the command of his elder brother. He continued in this capacity during the War of 1812, Perry transferred to the USS United States, commanded by the legendary Stephen Decatur, and saw little fighting in the war afterwards, since the ship was trapped in port at New London, Connecticut. Following the signing of the Treaty of Ghent which ended the war, Perry served under Commodore William Bainbridge during the Second Barbary War. He then served in African waters aboard USS Cyane during its patrol off Liberia from 1819–1820, after that cruise, Perry was sent to suppress piracy and the slave trade in the West Indies. Later during this period, while in port in Russia, Perry was offered a commission in the Imperial Russian Navy, Perry commanded the USS Shark, a schooner with 12 guns, in 1821–1825. In 1763, when Britain possessed Florida, the Spanish contended that the Florida Keys were part of Cuba, in 1815 the Spanish governor in Havana deeded the island of Key West to Juan Pablo Salas of Saint Augustine. After Florida was transferred to the United States, Salas sold Key West to American businessman John W. Simonton for $2,000 in 1821. Simonton lobbied the U. S. Government to establish a base on Key West both to take advantage of its strategic location and to bring law and order to the area. On March 25,1822, Perry sailed Shark to Key West and planted the U. S. flag, Perry renamed Cayo Hueso Thompsons Island for the Secretary of the Navy Smith Thompson and the harbor Port Rodgers for the president of the Board of Navy Commissioners. From 1826 to 1827 Perry acted as captain for Commodore Rodgers. Perry returned to Charleston, South Carolina for shore duty in 1828, and in 1830 took command of a sloop-of-war and he spent the years 1833–1837 as second officer of the New York Navy Yard, gaining promotion to captain at the end of this tour. He was a member of the Masons, Perry had an ardent interest and saw the need for the naval education, supporting an apprentice system to train new seamen, and helped establish the curriculum for the United States Naval Academy. He was a proponent of modernizing the Navy
20.
Black Ships
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The Black Ships was the name given to Western vessels arriving in Japan in the 16th and 19th centuries. In 1543 Portuguese initiated the first contacts, establishing a route linking Goa to Nagasaki. The large carracks engaged in trade had the hull painted black with pitch. In 1639, after suppressing a rebellion blamed on the Christian influence, the ruling Tokugawa shogunate retreated into an isolationist policy, during this locked state, contact with Japan by Westerners was restricted to Dejima island at Nagasaki. In 1844, William II of the Netherlands urged Japan to open, on July 8,1853, the U. S. Navy steamed four warships into the bay at Edo and threatened to attack if Japan did not begin trade with the West. Their arrival marked the reopening of the country to political dialogue after more than two hundred years of self-imposed isolation, trade with Western nations would not come until the Treaty of Amity and Commerce more than five years later. Black refers to the color of the older sailing vessels. In this sense, the became a symbol of the ending of isolation. In 1543 Portuguese traders arrived in Japan initiating the first contacts with the West, soon they established a trade route linking their headquarters in Goa, via Malacca to Nagasaki. Later, they engaged in trade, exchanging silver from Japan with silk from China via Macau. Carracks of 1200 to 1600 tons, named nau do trato or nau da China by the Portuguese, engaged in trade had the hull painted black with pitch. The name was inscribed in the Nippo Jisho, the first western Japanese dictionary compiled in 1603, in 1549 Spanish missionary Francis Xavier started a Jesuit mission in Japan. Christianity spread, mingled with the new trade, making 300,000 converts among peasants, in 1637 the Shimabara Rebellion blamed on the Christian influence was suppressed. Portuguese traders and Jesuit missionaries faced progressively tighter restrictions, and were confined to the island of Dejima before being expelled in 1639, the Tokugawa shogunate retreated back into a policy of isolationism identified as Sakoku, forbidding contact with most outside countries. Only a limited-scale trade and diplomatic relations with China, Korea, the Ryukyu Islands, the Sakoku policy remained in effect until 1853 with the arrival of Commodore Matthew Perry and the opening of Japan. The sight of the four ships entering Edo Bay, roaring black smoke into the air and capable of moving under their own power and it was eventually agreed upon that he should land nearby at Kurihama, whereupon he delivered his letter and left. The shogunate realized that—if they wished for their country to avoid a similar fate—they would need to make peace with the west, after a roughly a month of negotiations, the Shoguns officials presented Perry with the Treaty of Peace and Amity. Perry refused certain conditions of the treaty but agreed to defer their resolution to a later time, the eight ships departed, leaving behind a consul at Shimoda to negotiate a more permanent agreement
21.
Ansei great earthquakes
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The Ansei great earthquakes were a series of three major earthquakes that struck Japan during the Ansei era. The Ansei Tōkai quake was an 8.4 magnitude earthquake struck on December 23,1854. The epicenter ranged from Suruga Bay to the ocean, and struck primarily in the Tōkai region. Over 10,000 people from the Tōkai region down to Kyushu were killed, the Ansei Edo quake was a 6.9 magnitude earthquake which struck Edo on November 11,1855. One hundred and twenty earthquakes and tremors in total were felt in Edo in 1854-55, the great earthquake struck after 10 oclock in the evening, roughly 30 aftershocks continued until dawn. The epicenter was near the mouth of the Arakawa River, records from the time indicate 6,641 deaths inside the city, and 2,759 injuries, much of the city was destroyed by fire, leading many people to stay in rural inns. This quake was a particularly destructive deep thrust quake caused by a giant slab of rock stuck between the Philippine Sea Plate and the Pacific Plate, the earthquake was blamed on a giant catfish thrashing about. Ukiyo-e prints depicting namazu became very popular around this time, other notable quakes to strike in the Ansei period include one in the Iga area, one which registered 7.4 on the Richter scale and struck Kyushu and Shikoku. The 1858 Hietsu earthquake struck the Hietsu area on April 9,1858, List of earthquakes in Japan List of historical tsunamis 河出書房新社編集部. Yokohama Burning, The Deadly 1923 Earthquake And Fire That Helped Forge the Path to World War II
22.
Edo Castle
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Edo Castle, also known as Chiyoda Castle, is a flatland castle that was built in 1457 by Ōta Dōkan. It is today part of the Tokyo Imperial Palace and is located in Chiyoda, Tokyo, then known as Edo, Toshima District, Tokugawa Ieyasu established the Tokugawa shogunate here. It was the residence of the shogun and location of the shogunate, after the resignation of the shogun and the Meiji Restoration, it became the Tokyo Imperial Palace. Some moats, walls and ramparts of the castle survive to this day, however, the grounds were more extensive during the Edo period, with Tokyo Station and the Marunouchi section of the city lying within the outermost moat. It also encompassed Kitanomaru Park, the Nippon Budokan Hall and other landmarks of the surrounding area, the warrior Edo Shigetsugu built his residence in what is now the Honmaru and Ninomaru part of Edo Castle, around the end of the Heian or beginning of the Kamakura period. The Edo clan perished in the 15th century as a result of uprisings in the Kantō region, and Ōta Dōkan, the castle later came under the control of the Late Hōjō clan in 1524 after the Siege of Edo. The castle was vacated in 1590 due to the Siege of Odawara, Tokugawa Ieyasu made Edo Castle his base after he was offered eight eastern provinces by Toyotomi Hideyoshi. He later defeated Toyotomi Hideyori, son of Hideyoshi, at the Siege of Osaka in 1615, Tokugawa Ieyasu received the title of Seii Taishōgun in 1603, and Edo became the center of Tokugawas administration. Initially, parts of the area were lying under water, the sea reached the present Nishinomaru area of Edo Castle, and Hibiya was a beach. The landscape was changed for the construction of the castle, most construction started in 1593 and was completed in 1636 under Ieyasus grandson, Tokugawa Iemitsu. By this time, Edo had a population of 150,000, the existing Honmaru, Ninomaru, and Sannomaru areas were extended with the addition of the Nishinomaru, Nishinomaru-shita, Fukiage, and Kitanomaru areas. The daimyōs were required by the shōgun to supply building materials or finances, large granite stones were moved from afar, the size and number of the stones depended on the wealth of the daimyōs. The wealthier ones had to contribute more and those who did not supply stones were required to contribute labor for such tasks as digging the large moats and flattening hills. The earth that was taken from the moats was used as landfill for sea-reclamation or to level the ground, thus the construction of Edo Castle laid the foundation for parts of the city where merchants were able to settle. At least 10,000 men were involved in the first phase of the construction, when construction ended, the castle had 38 gates. The ramparts were almost 20 meters high and the walls were 12 meters high. Moats forming roughly concentric circles were dug for further protection, some moats reached as far as Ichigaya and Yotsuya, and parts of the ramparts survive to this day. This area is bordered by either the sea or the Kanda River, various fires over the centuries damaged or destroyed parts of the castle, Edo and the majority of its buildings being made of timber
23.
Ansei
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Ansei was a Japanese era name after Kaei and before Manen. This period spanned the years from November 1854 through March 1860, November 27,1854, The new era name of Ansei was created to herald the beginning of a peaceful period. The impetus and explanation for this change of era names was said to have been the burning of the Palace in Kyoto in the preceding summer. The new era name was derived from an aphorism, Rule peacefully over the masses. Although the notion seems appealing, the arrival of the Black Ships,1854, The Ansei-Tōkai Quake was an 8.4 magnitude earthquake which struck on December 23,1854. The epicenter ranged from Suruga Bay to the ocean, and struck primarily in the Tōkai region. Over 10,000 people from the Tōkai region down to Kyushu were killed,1855, Work was begun on re-constructing the Imperial Palace after the devastating fire of Kaei 7, and the project was completed in nine months. 1855, The emperor moved into the palace, having previously lived in the Shōgo-in. The people were permitted to view the grand Imperial progress, November 11,1855,1855 Edo earthquake, one of the Ansei great earthquakes, with resulting fire damage and loss of life. Epicenter --,6.9 magnitude on the Richter Scale, November 15,1857, Nagasaki Medical School is opened. Dr. Pompe van Meerdevoort gave the first formal public lecture on medical and surgical sciences at the new school, 1858-1860, Cholera outbreak is believed to have killed between 100,000 and 200,000 people in Edo alone. April 9,1858, The 1858 Hietsu earthquake kills hundreds,1858, The initial establishment of Keio University, seven years before the beginning of the Keio era, nevertheless, the university was named after the later era. This is the oldest existing institution of learning in Japan. July 29,1859, Tairō Ii Naosuke signs Japanese-American Treaty of Amity and Commerce,1858, Beginning of Ansei Purge at the order of Ii Naosuke on behalf of the bakufu. March 24,1860, Ii Naosuke was assassinated, also known as the Sakurada-mon Incident Ansei Treaties Cullen, a History of Japan, 1582-1941, Internal and External Worlds. ISBN9780521821551, ISBN9780521529181, OCLC50694793 Kusunoki Seiichirō, nihon shi omoshiro suiri, Nazo no satsujin jiken wo oe. The Autobiography of Ozaki Yukio, The Struggle for Constitutional Government in Japan, ISBN9780691050959, OCLC45363447 Nussbaum, Louis Frédéric and Käthe Roth. ISBN 978-0-674-01753-5, OCLC48943301 Ponsonby-Fane, Richard A. B, Kyoto, The Old Capital of Japan, 794-1869
24.
JSTOR
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JSTOR is a digital library founded in 1995. Originally containing digitized back issues of journals, it now also includes books and primary sources. It provides full-text searches of almost 2,000 journals, more than 8,000 institutions in more than 160 countries have access to JSTOR, most access is by subscription, but some older public domain content is freely available to anyone. William G. Bowen, president of Princeton University from 1972 to 1988, JSTOR originally was conceived as a solution to one of the problems faced by libraries, especially research and university libraries, due to the increasing number of academic journals in existence. Most libraries found it prohibitively expensive in terms of cost and space to maintain a collection of journals. By digitizing many journal titles, JSTOR allowed libraries to outsource the storage of journals with the confidence that they would remain available long-term, online access and full-text search ability improved access dramatically. Bowen initially considered using CD-ROMs for distribution, JSTOR was initiated in 1995 at seven different library sites, and originally encompassed ten economics and history journals. JSTOR access improved based on feedback from its sites. Special software was put in place to make pictures and graphs clear, with the success of this limited project, Bowen and Kevin Guthrie, then-president of JSTOR, wanted to expand the number of participating journals. They met with representatives of the Royal Society of London and an agreement was made to digitize the Philosophical Transactions of the Royal Society dating from its beginning in 1665, the work of adding these volumes to JSTOR was completed by December 2000. The Andrew W. Mellon Foundation funded JSTOR initially, until January 2009 JSTOR operated as an independent, self-sustaining nonprofit organization with offices in New York City and in Ann Arbor, Michigan. JSTOR content is provided by more than 900 publishers, the database contains more than 1,900 journal titles, in more than 50 disciplines. Each object is identified by an integer value, starting at 1. In addition to the site, the JSTOR labs group operates an open service that allows access to the contents of the archives for the purposes of corpus analysis at its Data for Research service. This site offers a facility with graphical indication of the article coverage. Users may create focused sets of articles and then request a dataset containing word and n-gram frequencies and they are notified when the dataset is ready and may download it in either XML or CSV formats. The service does not offer full-text, although academics may request that from JSTOR, JSTOR Plant Science is available in addition to the main site. The materials on JSTOR Plant Science are contributed through the Global Plants Initiative and are only to JSTOR
25.
International Standard Book Number
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The International Standard Book Number is a unique numeric commercial book identifier. An ISBN is assigned to each edition and variation of a book, for example, an e-book, a paperback and a hardcover edition of the same book would each have a different ISBN. The ISBN is 13 digits long if assigned on or after 1 January 2007, the method of assigning an ISBN is nation-based and varies from country to country, often depending on how large the publishing industry is within a country. The initial ISBN configuration of recognition was generated in 1967 based upon the 9-digit Standard Book Numbering created in 1966, the 10-digit ISBN format was developed by the International Organization for Standardization and was published in 1970 as international standard ISO2108. Occasionally, a book may appear without a printed ISBN if it is printed privately or the author does not follow the usual ISBN procedure, however, this can be rectified later. Another identifier, the International Standard Serial Number, identifies periodical publications such as magazines, the ISBN configuration of recognition was generated in 1967 in the United Kingdom by David Whitaker and in 1968 in the US by Emery Koltay. The 10-digit ISBN format was developed by the International Organization for Standardization and was published in 1970 as international standard ISO2108, the United Kingdom continued to use the 9-digit SBN code until 1974. The ISO on-line facility only refers back to 1978, an SBN may be converted to an ISBN by prefixing the digit 0. For example, the edition of Mr. J. G. Reeder Returns, published by Hodder in 1965, has SBN340013818 -340 indicating the publisher,01381 their serial number. This can be converted to ISBN 0-340-01381-8, the check digit does not need to be re-calculated, since 1 January 2007, ISBNs have contained 13 digits, a format that is compatible with Bookland European Article Number EAN-13s. An ISBN is assigned to each edition and variation of a book, for example, an ebook, a paperback, and a hardcover edition of the same book would each have a different ISBN. The ISBN is 13 digits long if assigned on or after 1 January 2007, a 13-digit ISBN can be separated into its parts, and when this is done it is customary to separate the parts with hyphens or spaces. Separating the parts of a 10-digit ISBN is also done with either hyphens or spaces, figuring out how to correctly separate a given ISBN number is complicated, because most of the parts do not use a fixed number of digits. ISBN issuance is country-specific, in that ISBNs are issued by the ISBN registration agency that is responsible for country or territory regardless of the publication language. Some ISBN registration agencies are based in national libraries or within ministries of culture, in other cases, the ISBN registration service is provided by organisations such as bibliographic data providers that are not government funded. In Canada, ISBNs are issued at no cost with the purpose of encouraging Canadian culture. In the United Kingdom, United States, and some countries, where the service is provided by non-government-funded organisations. Australia, ISBNs are issued by the library services agency Thorpe-Bowker
26.
OCLC
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The Online Computer Library Center is a US-based nonprofit cooperative organization dedicated to the public purposes of furthering access to the worlds information and reducing information costs. It was founded in 1967 as the Ohio College Library Center, OCLC and its member libraries cooperatively produce and maintain WorldCat, the largest online public access catalog in the world. OCLC is funded mainly by the fees that libraries have to pay for its services, the group first met on July 5,1967 on the campus of the Ohio State University to sign the articles of incorporation for the nonprofit organization. The group hired Frederick G. Kilgour, a former Yale University medical school librarian, Kilgour wished to merge the latest information storage and retrieval system of the time, the computer, with the oldest, the library. The goal of network and database was to bring libraries together to cooperatively keep track of the worlds information in order to best serve researchers and scholars. The first library to do online cataloging through OCLC was the Alden Library at Ohio University on August 26,1971 and this was the first occurrence of online cataloging by any library worldwide. Membership in OCLC is based on use of services and contribution of data, between 1967 and 1977, OCLC membership was limited to institutions in Ohio, but in 1978, a new governance structure was established that allowed institutions from other states to join. In 2002, the structure was again modified to accommodate participation from outside the United States. As OCLC expanded services in the United States outside of Ohio, it relied on establishing strategic partnerships with networks, organizations that provided training, support, by 2008, there were 15 independent United States regional service providers. OCLC networks played a key role in OCLC governance, with networks electing delegates to serve on OCLC Members Council, in early 2009, OCLC negotiated new contracts with the former networks and opened a centralized support center. OCLC provides bibliographic, abstract and full-text information to anyone, OCLC and its member libraries cooperatively produce and maintain WorldCat—the OCLC Online Union Catalog, the largest online public access catalog in the world. WorldCat has holding records from public and private libraries worldwide. org, in October 2005, the OCLC technical staff began a wiki project, WikiD, allowing readers to add commentary and structured-field information associated with any WorldCat record. The Online Computer Library Center acquired the trademark and copyrights associated with the Dewey Decimal Classification System when it bought Forest Press in 1988, a browser for books with their Dewey Decimal Classifications was available until July 2013, it was replaced by the Classify Service. S. The reference management service QuestionPoint provides libraries with tools to communicate with users and this around-the-clock reference service is provided by a cooperative of participating global libraries. OCLC has produced cards for members since 1971 with its shared online catalog. OCLC commercially sells software, e. g. CONTENTdm for managing digital collections, OCLC has been conducting research for the library community for more than 30 years. In accordance with its mission, OCLC makes its research outcomes known through various publications and these publications, including journal articles, reports, newsletters, and presentations, are available through the organizations website. The most recent publications are displayed first, and all archived resources, membership Reports – A number of significant reports on topics ranging from virtual reference in libraries to perceptions about library funding
27.
1771 Great Yaeyama Tsunami
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According to records,8,439 persons were killed on Ishigaki Island and 2,548 on Miyako Island. According to the Japanese government publication Rika-Nenpyō or Chronological Scientific Tables, according to the Mamoru Nakamura Laboratory, University of the Ryukyus, the earthquake was due to the activity of the fault east of Ishigaki and it is estimated that the magnitude was 7.5. Further simulation led to the activity of faults in the Ryukyu oceanic trench, also, there is a hypothesis that claims the magnitude was 8.5. This trench lies between the Philippine Sea Plate and the Eurasian Plate and it is considered that the earthquake registered an intensity of 4 in Yaeyama, and the damage by the earthquake was not as serious as the tsunami. The dead and missing amounted to 12,000 people, and more than 2,000 houses were destroyed on Ishigaki, agriculture was severely damaged because of sea water invasion and the population decreased to about one third of what it was before the earthquake. On Ishigaki island, the wave was 40 to 80 meters high, there are many huge rocks believed to have been left by the earthquake. There was a legend that an islet disappeared, but this has never been verified
28.
1792 Unzen earthquake and tsunami
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The 1792 Unzen earthquake and tsunami resulted from the volcanic activities of Mount Unzen on 21 May. This caused the collapse of the flank of the Mayuyama dome in front of Mount Unzen, resulting in a tremendous tsunami. It was also called, Shimabara erupted, Higo affected, since people were killed by this tsunami in Higo. Towards the end of 1791, a series of earthquakes occurred on the flank of Mount Unzen which gradually moved towards Fugen-dake. In February 1792, Fugen-dake started to erupt, triggering a lava flow which continued for two months, meanwhile, the earthquakes continued, shifting nearer to the city of Shimabara. It is not known to this day whether the collapse occurred as a result of an eruption of the dome or as a result of the earthquakes, the tsunami struck Higo Province on the other side of Ariake Bay before bouncing back and hitting Shimabara again. The waves reached a height of 33–66 ft, classing this tsunami as a small megatsunami, at the Osaki-bana point Futsu town, the waves locally grew to a height of 187 ft due to the effect of sea bottom topography. As of July,1991, the monuments have been found. Lake Shirachi is a pond in Shimabara city, Nagasaki Prefecture which was created after the landslide at Mayuyama created by the inpouring of underground water. Its size was first 1 km and 300m 400m, but the production of a water exit river made it smaller, as a result of the destruction, Tsukumojima or 99 islets or rocks were distributed near Shimabara city. In the same Nagasaki Prefecture, there are 99 islands or Kujūkushima distributed from Sasebo city to Hirado city and these islands are different from Tsukumojima. 1771 Great Yaeyama Tsunami List of earthquakes in Japan List of historical earthquakes
29.
1896 Sanriku earthquake
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The 1896 Sanriku earthquake was one of the most destructive seismic events in Japanese history. The 8.5 magnitude earthquake occurred at 19,32 on June 15,1896, approximately 166 kilometres off the coast of Iwate Prefecture and it resulted in two tsunamis which destroyed about 9,000 homes and caused at least 22,000 deaths. The waves reached a height of 38.2 metres. Seismologists have discovered the tsunamis magnitude was much greater than expected for the estimated seismic magnitude and this earthquake is now regarded as being part of a distinct class of seismic events, the tsunami earthquake. The epicenter lies just to the west of the Japan Trench, the trench forms part of the convergent boundary between the Pacific and Eurasian plates. The effects of a 20° dipping fault along the top of the plate was found to match both the observed seismic response and tsunami, but required a displacement of 10.4 m. The displacement was reduced to a reasonable value after the extra uplift caused by the deformation of sediments in the wedge. This revised fault model gave a magnitude of Mw=8. 0-8.1, a figure much closer to the estimated actual tsunami magnitude. A magnitude of 8.5 on the moment magnitude scale has also been estimated for this event, on the evening of June 15,1896, communities along the Sanriku coast in northern Japan were celebrating a Shinto holiday and the return of soldiers from the First Sino-Japanese War. After a small earthquake, there was concern because it was so weak. However 35 minutes later the first tsunami wave struck the coast, damage was particularly severe because the tsunamis coincided with high tides. Most deaths occurred in Iwate and Miyagi although casualties were recorded from Aomori. The power of the tsunami was great, large numbers of victims were found with broken bodies or missing limbs, as was their normal practice each evening, the local fishing fleets were all at sea when the tsunamis struck. In the deep water the wave went unnoticed, only when they returned the next morning did they discover the debris and bodies. Wave heights of up to 9 meters were also measured in Hawaii and they destroyed wharves and swept several houses away. Preventive coastal measures were not implemented until after another tsunami struck in 1933, due to higher levels of tsunami awareness, fewer casualties were recorded following the Sanriku earthquake. Nevertheless, the earthquake of 11 March 2011 caused a tsunami that resulted in thousands of deaths across the same region. 869 Sanriku earthquake 1933 Sanriku earthquake 2011 Tōhoku earthquake and tsunami List of earthquakes in Japan List of historical earthquakes Seismicity of the Sanriku coast
