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
