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Aso Caldera
Aso caldera (also known as Asosan, the Aso Volcano or Mount Aso, although the later term usually is used related to its currently active vents) is a geographical feature of Kumamoto Prefecture, Japan. It stretches 25 kilometers north to south and 18 kilometers east to west. The central core "Aso Gogaku" is the five major mountains in the area. Aso valley (Asodani) runs along the northern base of Mount Aso and Nango valley (Nangodani) along the south. According to research of caldera sediment, lakes used to exist in these valleys. The dried up lake areas have come to be called Old Aso Lake, Kugino Lake, and Aso Valley Lake. The Kikuchi, Shirakawa and Kurokawa rivers now drain the caldera. Geology Within the caldera are more than 17 cones. The central "Aso Gogaku" group of volcanoes are Takadake (Mount Taka) at , Nekodake at , Nakadake (Mount Naka) at , Kijimadake at and Eboshidake at . These are higher than the caldera rim itself that towards the south west is high. Othe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kumamoto Prefecture
is a prefecture of Japan located on the island of Kyūshū. Kumamoto Prefecture has a population of 1,748,134 () and has a geographic area of . Kumamoto Prefecture borders Fukuoka Prefecture to the north, Ōita Prefecture to the northeast, Miyazaki Prefecture to the southeast, and Kagoshima Prefecture to the south. Kumamoto is the capital and largest city of Kumamoto Prefecture, with other major cities including Yatsushiro, Amakusa, and Tamana. Kumamoto Prefecture is located in the center of Kyūshū on the coast of the Ariake Sea, across from Nagasaki Prefecture, with the mainland separated from the East China Sea by the Amakusa Archipelago. Kumamoto Prefecture is home to Mount Aso, the largest active volcano in Japan and among the largest in the world, with its peak above sea level. History Historically, the area was called Higo Province; and the province was renamed Kumamoto during the Meiji Restoration. The creation of prefectures was part of the abolition of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Magma
Magma () is the molten or semi-molten natural material from which all igneous rocks are formed. Magma is found beneath the surface of the Earth, and evidence of magmatism has also been discovered on other terrestrial planets and some natural satellites. Besides molten rock, magma may also contain suspended crystals and gas bubbles. Magma is produced by melting of the mantle or the crust in various tectonic settings, which on Earth include subduction zones, continental rift zones, mid-ocean ridges and hotspots. Mantle and crustal melts migrate upwards through the crust where they are thought to be stored in magma chambers or trans-crustal crystal-rich mush zones. During magma's storage in the crust, its composition may be modified by fractional crystallization, contamination with crustal melts, magma mixing, and degassing. Following its ascent through the crust, magma may feed a volcano and be extruded as lava, or it may solidify underground to form an intrusion, such ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mount Kujū
, located on the border of Kokonoe and Taketa in Ōita Prefecture, Japan, is the highest mountain in Kyushu Island, Japan, with a summit elevation of . It is one of the 100 Famous Japanese Mountains. It is part of the Aso-Kujū National Park. Summary The Kujū range consists of a dozen or so volcanic bodies gathered in a region of 13km east-west and 10km north-south. The mountains in the range include: *Kujū Mountains **Mount Kujū (1,787 m)- The main peak (久住山) **Mount Nakadake (1,791 m)- The highest peak in Kyushu **Mount Inahoshi (1,774 m) **Mount Hōsshō (1,762 m) **Mount Mimata (1,745 m) *Taisen Mountains **Mount Taisen (1,786 m) **Mount North (Kita) Taisen (1,706 m) **Mount Heiji (1,642 m) The Kujū volcanic group is mainly composed of andesite and dacite, which is defined as the volcanic activity above the Miyagi pyroclastic flow deposit which formed about 200,000 years ago. The north and south areas of Mt. Kujū are plateau grasslands whose main industry is d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oita Prefecture
Oita often refers to: * Ōita Prefecture, Kyushu, Japan * Ōita (city), the capital of the prefecture Oita or Ōita may also refer to: Places * Ōita District, Ōita, a former district in Ōita Prefecture, Japan *Ōita Stadium, a multi-use stadium in Ōita, Ōita Prefecture, Japan * Oița River, a tributary of the Bistriţa River in Romania *Roman Catholic Diocese of Oita, a diocese in the city of Ōita in the Ecclesiastical province of Nagasaki, Japan *Mount Oeta (also "Oita" or "Oiti"), a mountain in Central Greece Education * Oita Junior College, a private junior college in Ōita, Ōita Prefecture, Japan * Oita Prefectural College of Arts and Culture, a private junior college in Ōita, Ōita Prefecture, Japan * Oita University, a national university in Ōita, Ōita Prefecture, Japan * Oita University of Nursing and Health Sciences, a public university in Ōita, Ōita Prefecture, Japan Transportation * Oita Airport, an airport in Kunisaki, Ōita Prefecture, Japan * Ōita Sta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mount Yufu
is a volcano, located on the border of Yufu and Beppu, Ōita, Japan. It is located within Aso Kujū National Park. Outline Mount Yufu is a stratovolcano. It has two peaks, called ‘Higashi-mine’ (East Peak) and ‘Nishi-mine’ (West Peak). Nishi-mine is about one meter higher than Higashi-Mine. See also *List of islands in Japan *List of volcanoes in Japan *List of mountains in Japan The following is a list of the mountains and hills of Japan, ordered by height. Mountains over 1000 meters Mountains under 1000 meters As the generally accepted definition of a mountain (versus a hill) is 1000 m of height and 500 m of pro ... Route The most popular route is from Yufu Tozanguchi Bus Stop of Kamenoi Bus. It takes two and half hours. There are other routes from Yufu City and Higashi Tozanguchi Bus Stop. Gallery File:Mt.yufu.jpg, SSW side File:Mt.Yufudake 03.jpg, S side Image:Yufudake01.JPG, Viewed from Mt. Tsurumi Image:Yufudake03.JPG, Collapsed section Image: ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pacific Plate
The Pacific Plate is an oceanic tectonic plate that lies beneath the Pacific Ocean. At , it is the largest tectonic plate. The plate first came into existence 190 million years ago, at the triple junction between the Farallon, Phoenix, and Izanagi Plates. The Pacific Plate subsequently grew to where it underlies most of the Pacific Ocean basin. This reduced the Farallon Plate to a few remnants along the west coast of North America and the Phoenix Plate to a small remnant near the Drake Passage, and destroyed the Izanagi Plate by subduction under Asia. The Pacific Plate contains an interior hot spot forming the Hawaiian Islands. Boundaries 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 eastern side is a transform boundary with the North American Plate along the San Andreas Fault, and a boundary ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Okinawa Plate
The Okinawa Plate, or Okinawa Platelet, is a minor continental tectonic plate in the northern and eastern hemispheres stretching from the northern end of Taiwan to the southern tip of the island of Kyūshū. The Okinawa Plate hosts typical earthquakes, like the 1911 Kikai Island earthquake, and various types of slow earthquakes, including low frequency earthquakes, very low frequency earthquakes, tremor, and slow slip events. Boundaries The eastern side of the Okinawa Plate forms a convergent boundary with the Philippine Sea Plate, forming the Ryukyu Trench and the island arc that forms the Ryukyu Islands. The Okinawa Plate is bounded on the western side by the Okinawa Trough, a back arc basin and divergent boundary with the Yangtze Plate. A section of the southern boundary between the Okinawa Plate and the Philippine Sea Plate is a former subduction zone that now accommodates oblique slip and was the location of the 1771 Great Yaeyama Tsunami The 1771 Great Yaeyama Tsu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amur Plate
The Amurian Plate (or Amur Plate; also occasionally referred to as the China Plate, not to be confused with the South China Subplate) is a minor tectonic plate in the northern and eastern hemispheres. It covers Manchuria, the Korean Peninsula, the Sea of Japan, Shikoku, Kyushu, southwest Honshu ( Kansai, Chūgoku), eastern Mongolia and the south of Russian Far East. Once thought to be a part of the Eurasian Plate, the Amurian Plate is now generally considered to be a separate plate moving southeast with respect to the Eurasian Plate. The Amurian Plate is named after the Amur River, which forms the border between the Russian Far East and Northeastern China. It is bounded on the north, west, and southwest by the Eurasian Plate, on the east by the Okhotsk Plate, to the southeast by the Philippine Sea Plate along the Suruga Trough and the Nankai Trough, and the Okinawa Plate, and the Yangtze Plate.Yu. F. Malyshev, et al. Deep structure of the Amur lithospheric Plate border zo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hokkaido
is Japan's second largest island and comprises the largest and northernmost prefecture, making up its own region. The Tsugaru Strait separates Hokkaidō from Honshu; the two islands are connected by the undersea railway Seikan Tunnel. The largest city on Hokkaidō is its capital, Sapporo, which is also its only ordinance-designated city. Sakhalin lies about 43 kilometers (26 mi) to the north of Hokkaidō, and to the east and northeast are the Kuril Islands, which are administered by Russia, though the four most southerly are claimed by Japan. Hokkaidō was formerly known as ''Ezo'', ''Yezo'', ''Yeso'', or ''Yesso''. Nussbaum, Louis-Frédéric. (2005). "Hokkaidō" in Although there were Japanese settlers who ruled the southern tip of the island since the 16th century, Hokkaido was considered foreign territory that was inhabited by the indigenous people of the island, known as the Ainu people. While geographers such as Mogami Tokunai and Mamiya Rinzō explored the isl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dense-rock Equivalent
Dense-rock equivalent (DRE) is a volcanologic calculation used to estimate volcanic eruption volume. One of the widely accepted measures of the size of a historic or prehistoric eruption is the volume of magma ejected as pumice and volcanic ash, known as tephra during an explosive phase of the eruption, or the volume of lava extruded during an effusive phase of a volcanic eruption. Eruption volumes are commonly expressed in cubic kilometers (km3). Historical and geological estimates of tephra volumes are usually obtained by mapping the distribution and thickness of tephra deposits on the ground after the eruption is over. For historical volcanic explosions, further estimates must be made of tephra deposits that might have changed significantly over time by other geological processes including erosion. Tephra volumes measured in this way must then be corrected for void spaces ( vesicles – bubbles within the pumice, empty spaces between individual pieces of pumice or ash) to get ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanic Plateau
A volcanic plateau is a plateau produced by volcanic activity. There are two main types: lava plateaus and pyroclastic plateaus. Lava plateau Lava plateaus are formed by highly fluid basaltic lava during numerous successive eruptions through numerous vents without violent explosions (quiet eruptions). These eruptions are quiet because of low viscosity of lava, so that it is very fluid and contains a small amount of trapped gases. The resulting sheet lava flows may be extruded from linear fissures or rifts or gigantic volcanic eruptions through multiple vents characteristic of the prehistoric era which produced giant flood basalts. Multiple successive and extensive lava flows cover the original landscape to eventually form a plateau, which may contain lava fields, cinder cones, shield volcanoes and other volcanic landforms. In some cases, a lava plateau may be part of a single volcano. An example is the massive Level Mountain shield volcano in northern British Columbia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yamaguchi Prefecture
is a prefecture of Japan located in the Chūgoku region of Honshu. Yamaguchi Prefecture has a population of 1,377,631 (1 February 2018) and has a geographic area of 6,112 km2 (2,359 sq mi). Yamaguchi Prefecture borders Shimane Prefecture to the north and Hiroshima Prefecture to the northeast. Yamaguchi is the capital and Shimonoseki is the largest city of Yamaguchi Prefecture, with other major cities including Ube, Shūnan, and Iwakuni. Yamaguchi Prefecture is located at the western tip of Honshu with coastlines on the Sea of Japan and Seto Inland Sea, and separated from the island of Kyushu by the Kanmon Straits. History Yamaguchi Prefecture was created by the merger of the provinces of Suō and Nagato. During the rise of the samurai class during the Heian and Kamakura Periods (794–1333), the Ouchi family of Suō Province and the Koto family of Nagato Province gained influence as powerful warrior clans. In the Muromachi period (1336—1573), Ouchi Hir ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
