Geospatial Information Authority of Japan
The Geospatial Information Authority of Japan, or GSI, is the national institution responsible for surveying and mapping the national land of Japan. The former name of the organization from 1949 until March 2010 was Geographical Survey Institute, it is an organization attached to the Ministry of Land, Infrastructure and Tourism. Its main offices are situated in Tsukuba City of Ibaraki Prefecture, it runs a museum, situated in Tsukuba, the Science Museum of Map and Survey. Stationary MT monitoring systems have been installed in Japan since April 1996, providing a continuous recording of MT signals at the Mizusawa Geodetic Observatory and the Esashi Station of the GSI; these stations measure fluctuations in the earth's electromagnetic field that correspond with seismic activity. The raw geophysical time-series data from these monitoring stations is available to the scientific community, enabling further study of the interaction between EM events and earthquake activity; the MT time series data from the GSIJ earthquake monitoring stations is available online at http://vldb.gsi.go.jp/sokuchi/geomag/menu_03/mt_data.html The Authority is represented on the national Coordinating Committee for Earthquake Prediction.
The Japanese water height reference point is installed in a small building in front of the National Diet Building in Nagatacho Chiyoda, Tokyo. The building is called the Japanese water height reference point storehouse. Construction of the building started on August 1890 and it was completed on December 24, 1891, it serves as a reference point for elevations in Japan. The building can not be entered. Elevations of Japan are determined with reference to the mean sea level of Tokyo Bay; this is called mean sea level of Tokyo Bay or Tokyo Peil, where the word Peil comes from the Dutch language. The stone base monument of the datum has a crystal scale with a 0 which indicates 24.3900 m above the mean sea level of Tokyo Bay since October 21, 2011. Since it is difficult to refer to the altitude in Tokyo for remote islands, 37 islands have their own zero point; the heights of Okinawa z. B. are measured from the middle water level of Nakagusuku Bay and that of Miyake from the Ako Bay. The GSI featured in the novel Norwegian Wood by Haruki Murakami as the intended workplace of his roommate, "stormtrooper".
At the time the novel was set, in the late sixties, the GSI was situated in Tokyo. Japanese maps, the history of mapping in Japan. Japanese map symbols, the official symbols used by the GSI in maps. Global Map Official Website
A mountain range or hill range is a series of mountains or hills ranged in a line and connected by high ground. A mountain system or mountain belt is a group of mountain ranges with similarity in form and alignment that have arisen from the same cause an orogeny. Mountain ranges are formed by a variety of geological processes, but most of the significant ones on Earth are the result of plate tectonics. Mountain ranges are found on many planetary mass objects in the Solar System and are a feature of most terrestrial planets. Mountain ranges are segmented by highlands or mountain passes and valleys. Individual mountains within the same mountain range do not have the same geologic structure or petrology, they may be a mix of different orogenic expressions and terranes, for example thrust sheets, uplifted blocks, fold mountains, volcanic landforms resulting in a variety of rock types. Most geologically young mountain ranges on the Earth's land surface are associated with either the Pacific Ring of Fire or the Alpide Belt.
The Pacific Ring of Fire includes the Andes of South America, extends through the North American Cordillera along the Pacific Coast, the Aleutian Range, on through Kamchatka, Taiwan, the Philippines, Papua New Guinea, to New Zealand. The Andes is 7,000 kilometres long and is considered the world's longest mountain system; the Alpide belt includes Indonesia and Southeast Asia, through the Himalaya, Caucasus Mountains, Balkan Mountains fold mountain range, the Alps, ends in the Spanish mountains and the Atlas Mountains. The belt includes other European and Asian mountain ranges; the Himalayas contain the highest mountains in the world, including Mount Everest, 8,848 metres high and traverses the border between China and Nepal. Mountain ranges outside these two systems include the Arctic Cordillera, the Urals, the Appalachians, the Scandinavian Mountains, the Great Dividing Range, the Altai Mountains and the Hijaz Mountains. If the definition of a mountain range is stretched to include underwater mountains the Ocean Ridges form the longest continuous mountain system on Earth, with a length of 65,000 kilometres.
The mountain systems of the earth are characterized by a tree structure, where mountain ranges can contain sub-ranges. The sub-range relationship is expressed as a parent-child relationship. For example, the White Mountains of New Hampshire and the Blue Ridge Mountains are sub-ranges of the Appalachian Mountains. Equivalently, the Appalachians are the parent of the White Mountains and Blue Ridge Mountains, the White Mountains and the Blue Ridge Mountains are children of the Appalachians; the parent-child expression extends to the sub-ranges themselves: the Sandwich Range and the Presidential Range are children of the White Mountains, while the Presidential Range is parent to the Northern Presidential Range and Southern Presidential Range. The position of mountains influences climate, such as snow; when air masses move up and over mountains, the air cools producing orographic precipitation. As the air descends on the leeward side, it warms again and is drier, having been stripped of much of its moisture.
A rain shadow will affect the leeward side of a range. Mountain ranges are subjected to erosional forces which work to tear them down; the basins adjacent to an eroding mountain range are filled with sediments which are buried and turned into sedimentary rock. Erosion is at work while the mountains are being uplifted until the mountains are reduced to low hills and plains; the early Cenozoic uplift of the Rocky Mountains of Colorado provides an example. As the uplift was occurring some 10,000 feet of Mesozoic sedimentary strata were removed by erosion over the core of the mountain range and spread as sand and clays across the Great Plains to the east; this mass of rock was removed as the range was undergoing uplift. The removal of such a mass from the core of the range most caused further uplift as the region adjusted isostatically in response to the removed weight. Rivers are traditionally believed to be the principal cause of mountain range erosion, by cutting into bedrock and transporting sediment.
Computer simulation has shown that as mountain belts change from tectonically active to inactive, the rate of erosion drops because there are fewer abrasive particles in the water and fewer landslides. Mountains on other planets and natural satellites of the Solar System are isolated and formed by processes such as impacts, though there are examples of mountain ranges somewhat similar to those on Earth. Saturn's moon Titan and Pluto, in particular exhibit large mountain ranges in chains composed of ices rather than rock. Examples include the Mithrim Montes and Doom Mons on Titan, Tenzing Montes and Hillary Montes on Pluto; some terrestrial planets other than Earth exhibit rocky mountain ranges, such as Maxwell Montes on Venus taller than any on Earth and Tartarus Montes on Mars, Jupiter's moon Io has mountain ranges formed from tectonic processes including Boösaule Montes, Dorian Montes, Hi'iaka Montes and Euboea Montes. Peakbagger Ranges Home Page Bivouac.com
Global Volcanism Program
The Smithsonian Institution's Global Volcanism Program documents Earth's volcanoes and their eruptive history over the past 10,000 years. The GVP reports on current eruptions from around the world as well as maintaining a database repository on active volcanoes and their eruptions. In this way, a global context for the planet's active volcanism is presented. Smithsonian reporting on current volcanic activity dates back to 1968, with the Center for Short-Lived Phenomena; the GVP is housed in the Department of Mineral Sciences, part of the National Museum of Natural History, on the National Mall in Washington, D. C. During the early stages of an eruption, the GVP acts as a clearing house of reports and imagery which are accumulated from a global network of contributors; the early flow of information is managed such that the right people are contacted as well as helping to sort out vague and contradictory aspects that arise during the early days of an eruption. The Weekly Volcanic Activity Report is a cooperative project between the Smithsonian's Global Volcanism Program and the United States Geological Survey's Volcano Hazards Program.
Notices of volcanic activity posted on the report website are preliminary and subject to change as events are studied in more detail. Detailed reports on various volcanoes are published monthly in the Bulletin of the Global Volcanism NetworkThe GVP documents the last 10,000 years of Earth's volcanism; the historic activity can guide perspectives on possible future events and on volcanoes showing activity. GVP's volcano and eruption databases constitute a foundation for all statistical statements concerning locations and magnitudes of Earth's volcanic eruptions during the past recent 10,000 years. Two editions of Volcanoes of the World, a regional directory... and were published based on the GVP data and interpretations. Prediction of volcanic activity Timeline of volcanism on Earth Volcanic explosivity index Volcano Number Global Volcanism Program Global Volcanism Program Facebook page
Virtual International Authority File
The Virtual International Authority File is an international authority file. It is a joint project of several national libraries and operated by the Online Computer Library Center. Discussion about having a common international authority started in the late 1990s. After a series of failed attempts to come up with a unique common authority file, the new idea was to link existing national authorities; this would present all the benefits of a common file without requiring a large investment of time and expense in the process. The project was initiated by the US Library of Congress, the German National Library and the OCLC on August 6, 2003; the Bibliothèque nationale de France joined the project on October 5, 2007. The project transitioned to being a service of the OCLC on April 4, 2012; the aim is to link the national authority files to a single virtual authority file. In this file, identical records from the different data sets are linked together. A VIAF record receives a standard data number, contains the primary "see" and "see also" records from the original records, refers to the original authority records.
The data are available for research and data exchange and sharing. Reciprocal updating uses the Open Archives Initiative Protocol for Metadata Harvesting protocol; the file numbers are being added to Wikipedia biographical articles and are incorporated into Wikidata. VIAF's clustering algorithm is run every month; as more data are added from participating libraries, clusters of authority records may coalesce or split, leading to some fluctuation in the VIAF identifier of certain authority records. Authority control Faceted Application of Subject Terminology Integrated Authority File International Standard Authority Data Number International Standard Name Identifier Wikipedia's authority control template for articles Official website VIAF at OCLC
Hokkaido known as Ezo, Yeso, or Yesso, is the second largest island of Japan, the largest and northernmost prefecture. The Tsugaru Strait separates Hokkaido from Honshu; the two islands are connected by the undersea railway Seikan Tunnel. The largest city on Hokkaido is its capital, its only ordinance-designated city. About 43 km north of Hokkaido lies Russia. To its east and north-east are the disputed Kuril Islands; the Nihon Shoki, finished in 720 AD, is said to be the first mention of Hokkaido in recorded history. According to the text, Abe no Hirafu led a large navy and army to northern areas from 658 to 660 and came into contact with the Mishihase and Emishi. One of the places Hirafu went to was called Watarishima, believed to be present-day Hokkaido. However, many theories exist in relation to the details of this event, including the location of Watarishima and the common belief that the Emishi in Watarishima were the ancestors of the present-day Ainu people. During the Nara and Heian periods, people in Hokkaido conducted trade with Dewa Province, an outpost of the Japanese central government.
From the Middle Ages, the people in Hokkaido began to be called Ezo. Hokkaido subsequently became known as Ezogashima; the Ezo relied upon hunting and fishing and obtained rice and iron through trade with the Japanese. During the Muromachi period, the Japanese created a settlement at the south of the Oshima Peninsula; as more people moved to the settlement to avoid battles, disputes arose between the Japanese and the Ainu. The disputes developed into a war. Takeda Nobuhiro killed the Ainu leader and defeated the opposition in 1457. Nobuhiro's descendants became the rulers of the Matsumae-han, granted exclusive trading rights with the Ainu in the Azuchi-Momoyama and Edo periods; the Matsumae family's economy relied upon trade with the Ainu. They held authority over the south of Ezochi until the end of the Edo period in 1868; the Matsumae clan rule over the Ainu must be understood in the context of the expansion of the Japanese feudal state. Medieval military leaders in northern Honshū maintained only tenuous political and cultural ties to the imperial court and its proxies, the Kamakura Shogunate and Ashikaga Shogunate.
Feudal strongmen sometimes located themselves within medieval institutional order, taking shogunal titles, while in other times they assumed titles that seemed to give them a non-Japanese identity. In fact, many of the feudal strongmen were descended from Emishi military leaders, assimilated into Japanese society; the Matsumae clan were of Yamato descent like other ethnic Japanese people, whereas the Emishi of northern Honshu were a distinctive group related to the Ainu. The Emishi were conquered and integrated into the Japanese state dating back as far as the 8th century, as result began to lose their distinctive culture and ethnicity as they became minorities. By the time the Matsumae clan ruled over the Ainu most of the Emishi were ethnically mixed and physically closer to Japanese than they were to Ainu; this dovetails nicely with the "transformation" theory that native Jōmon peoples changed with the infusion of Yayoi immigrants into the Tōhoku rather than the "replacement" theory which posits that one population was replaced by another.
There were numerous revolts by the Ainu against the feudal rule. The last large-scale resistance was Shakushain's Revolt in 1669–1672. In 1789, a smaller movement, the Menashi–Kunashir rebellion, was crushed. After that rebellion, the terms "Japanese" and "Ainu" referred to distinguished groups, the Matsumae were unequivocally Japanese. In 1799–1821 and 1855–1858, the Edo Shogunate took direct control over Hokkaido in response to a perceived threat from Russia. Leading up to the Meiji Restoration, the Tokugawa Shogunate realized there was a need to prepare northern defenses against a possible Russian invasion and took over control of most of Ezochi; the Shogunate made the plight of the Ainu easier, but did not change the overall form of rule. Hokkaido was known as Ezochi until the Meiji Restoration. Shortly after the Boshin War in 1868, a group of Tokugawa loyalists led by Enomoto Takeaki temporarily occupied the island, but the rebellion was crushed in May 1869. Ezochi was subsequently put under control of Hakodate Prefectural Government.
When establishing the Development Commission, the Meiji Government introduced a new name. After 1869, the northern Japanese island was known as Hokkaido; the primary purpose of the development commission was to secure Hokkaido before the Russians extended their control of the Far East beyond Vladivostok. Kuroda Kiyotaka was put in charge of the venture, his first step was to journey to the United States and recruit Horace Capron, President Grant's Commissioner of Agriculture. From 1871 to 1873 Capron bent his efforts to expounding Western agriculture and mining with mixed results. Capron, frustrated with obstacles to his efforts returned home in 1875. In 1876, William S. Clark arrived to found an agricultural college in Sapporo. Although he only remained a year, Clark left a lasting impression on Hokkaido, inspiring the Japanese with his teachings on agriculture as well as Christianity
An earthquake is the shaking of the surface of the Earth, resulting from the sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in size from those that are so weak that they cannot be felt to those violent enough to toss people around and destroy whole cities; the seismicity, or seismic activity, of an area is the frequency and size of earthquakes experienced over a period of time. The word tremor is used for non-earthquake seismic rumbling. At the Earth's surface, earthquakes manifest themselves by shaking and displacing or disrupting the ground; when the epicenter of a large earthquake is located offshore, the seabed may be displaced sufficiently to cause a tsunami. Earthquakes can trigger landslides, volcanic activity. In its most general sense, the word earthquake is used to describe any seismic event—whether natural or caused by humans—that generates seismic waves. Earthquakes are caused by rupture of geological faults, but by other events such as volcanic activity, mine blasts, nuclear tests.
An earthquake's point of initial rupture is called its hypocenter. The epicenter is the point at ground level directly above the hypocenter. Tectonic earthquakes occur anywhere in the earth where there is sufficient stored elastic strain energy to drive fracture propagation along a fault plane; the sides of a fault move past each other smoothly and aseismically only if there are no irregularities or asperities along the fault surface that increase the frictional resistance. Most fault surfaces do have such asperities and this leads to a form of stick-slip behavior. Once the fault has locked, continued relative motion between the plates leads to increasing stress and therefore, stored strain energy in the volume around the fault surface; this continues until the stress has risen sufficiently to break through the asperity allowing sliding over the locked portion of the fault, releasing the stored energy. This energy is released as a combination of radiated elastic strain seismic waves, frictional heating of the fault surface, cracking of the rock, thus causing an earthquake.
This process of gradual build-up of strain and stress punctuated by occasional sudden earthquake failure is referred to as the elastic-rebound theory. It is estimated that only 10 percent or less of an earthquake's total energy is radiated as seismic energy. Most of the earthquake's energy is used to power the earthquake fracture growth or is converted into heat generated by friction. Therefore, earthquakes lower the Earth's available elastic potential energy and raise its temperature, though these changes are negligible compared to the conductive and convective flow of heat out from the Earth's deep interior. There are three main types of fault, all of which may cause an interplate earthquake: normal and strike-slip. Normal and reverse faulting are examples of dip-slip, where the displacement along the fault is in the direction of dip and movement on them involves a vertical component. Normal faults occur in areas where the crust is being extended such as a divergent boundary. Reverse faults occur in areas.
Strike-slip faults are steep structures where the two sides of the fault slip horizontally past each other. Many earthquakes are caused by movement on faults that have components of both dip-slip and strike-slip. Reverse faults those along convergent plate boundaries are associated with the most powerful earthquakes, megathrust earthquakes, including all of those of magnitude 8 or more. Strike-slip faults continental transforms, can produce major earthquakes up to about magnitude 8. Earthquakes associated with normal faults are less than magnitude 7. For every unit increase in magnitude, there is a thirtyfold increase in the energy released. For instance, an earthquake of magnitude 6.0 releases 30 times more energy than a 5.0 magnitude earthquake and a 7.0 magnitude earthquake releases 900 times more energy than a 5.0 magnitude of earthquake. An 8.6 magnitude earthquake releases the same amount of energy as 10,000 atomic bombs like those used in World War II. This is so because the energy released in an earthquake, thus its magnitude, is proportional to the area of the fault that ruptures and the stress drop.
Therefore, the longer the length and the wider the width of the faulted area, the larger the resulting magnitude. The topmost, brittle part of the Earth's crust, the cool slabs of the tectonic plates that are descending down into the hot mantle, are the only parts of our planet which can store elastic energy and release it in fault ruptures. Rocks hotter than about 300 °C flow in response to stress; the maximum observed lengths of ruptures and mapped faults are 1,000 km. Examples are the earthquakes in Chile, 1960; the longest earthquake ruptures on strike-slip faults, like the San Andreas Fault, the North Anatolian Fault in Turkey and the Denali Fault in Alaska, are about half to one third as long as the lengths along subducting plate margins, those along normal faults are shorter. The most important parameter controlling the maximum earthquake magnitude on a fault is however not the maximum available length, but the available width because the latter varies by a factor of 20. Along converging plate margins, the dip angle of the rupture plane is shallow about 10 de
Masao Mimatsu was a Japanese postmaster who recorded the growth of the Shōwa-shinzan mountain in 1944–1945. On 31 December 1943, Shōwa-shinzan began forming from rapid uplifing of a wheat field as a result of a sudden earthquake; this seismic event would change into volcanic activity and result in the eruption of Mount Usu in 1944. Due to the Japanese war effort, basic scientific materials were unavailable. However, the postmaster of Sobetsu-cho, recorded measurements and drew diagrams of the rising mountain on paper; the story goes that in 1946, in order to study the volcano more he bought up the land using all of his savings and became owner of the volcano. A conflicting story described in Time on Monday, 4 July 1949 indicates this purchase to be around 1944, to have happened as a result of pressure from the villagers of Fukaba. Whatever the reasons, what Mimatsu gleaned from his "pet volcano" would be the basis for much understanding in years to come. Despite his amateur status, when he presented his data and sketches to the World Volcano Conference in Oslo in 1948, his work was praised by professional volcanologists.
His papers were referred to as the "Mimatsu Diagram" and for them he received the First Hokkaido Cultural Award. In 1977, he was able to witness the third eruption of Mt. Usu in his lifetime. However, he died of illness on December 8 of the same year without being able to witness the end of the eruptive event, he is now honoured by a statue at the base of Usuzan, his work is celebrated in the Mimatsu Masao Memorial Hall near the site of Shōwa-shinzan. 8728 Mimatsu, an asteroid named after Mimatsu The Thief Akikazu Inoue, a manga by Osamu Tezuka, with the titular story based on Mimatsu's biography