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Akita-Yakeyama
Akita-Yake-Yama is a small stratovolcano in Akita Prefecture, Japan, that is known for its radioactive waters. A small parasitic lava dome is located four kilometers from the volcano. Historical eruptions Eruptions during historical times are limited to moderate phreatic eruptions, which have been recorded since 1678. May 1997 eruption On 11 May 1997, after a landslide a few days later, an eruption began. The eruption took place at a hot spring in a resort called Sumikawa-Onsen. On 10 May, tremors were reported at the hot spring up until midnight. On 11 May, a party saw a fast moving landslide moving down the slope of the volcano 20 minutes before the explosion. The eruption started around 08:00 am and was witnessed by a pilot who was flying over the area. He reported that he saw a water and steam ejection, like a giant geyser, followed by an eruption of black smoke. The explosion triggered a mudflow, that travelled down a nearby river valley. The field party then noticed te ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Akita-Yakeyama Relief Map, SRTM-1
Akita-Yake-Yama is a small stratovolcano in Akita Prefecture, Japan, that is known for its radioactive waters. A small parasitic lava dome is located four kilometers from the volcano. Historical eruptions Eruptions during historical times are limited to moderate phreatic eruptions, which have been recorded since 1678. May 1997 eruption On 11 May 1997, after a landslide a few days later, an eruption began. The eruption took place at a hot spring in a resort called Sumikawa-Onsen. On 10 May, tremors were reported at the hot spring up until midnight. On 11 May, a party saw a fast moving landslide moving down the slope of the volcano 20 minutes before the explosion. The eruption started around 08:00 am and was witnessed by a pilot who was flying over the area. He reported that he saw a water and steam ejection, like a giant geyser, followed by an eruption of black smoke. The explosion triggered a mudflow, that travelled down a nearby river valley. The field party then noticed tephr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Volcanoes In Japan
This is a list of active and extinct volcanoes in Japan. An Orange background indicates a volcano considered active by the Japan Meteorological Agency. Hokkaido Honshū Izu Islands Ogasawara Archipelago The Ogasawara Archipelago include the Bonin Islands and Volcano Islands. Kyūshū Ryūkyū Islands See also * Notes and references Notes References External links Quaternary Volcanoes of Japan- Geological Survey of Japan - Geological Survey of Japan * ttp://www.data.jma.go.jp/svd/vois/data/tokyo/STOCK/souran_eng/souran.htm The National Catalogue of the Active Volcanoes in Japan- Japan Meteorological Agency 日本の主な山岳標高 (Elevation of Principal Mountains in Japan)- Geospatial Information Authority of Japan {{Asia topic, List of volcanoes in Japan Lists of coordinates Volcanoes A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Akita Prefecture
is a prefecture of Japan located in the Tōhoku region of Honshu.Nussbaum, Louis-Frédéric. (2005). "Provinces and prefectures" in ; "Tōhoku" in . Its population is approximately 966,000 (as of 1 October 2019) and its geographic area is 11,637 km2 (4,493 sq mi). Akita Prefecture is bordered by Aomori Prefecture to the north, Iwate Prefecture to the east, Miyagi Prefecture to the southeast, and Yamagata Prefecture to the south. Akita is the capital and largest city of Akita Prefecture. Other major cities include Yokote, Daisen, and Yurihonjō. Akita Prefecture is located on the coast of the Sea of Japan and extends east to the Ōu Mountains, the longest mountain range in Japan, at the border with Iwate Prefecture. Akita Prefecture formed the northern half of the historic Dewa Province with Yamagata Prefecture. History The region of Akita was created from the ancient provinces of Dewa and Mutsu. Separated from the principal Japanese centres of commerce, politics, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tephra
Tephra is fragmental material produced by a volcanic eruption regardless of composition, fragment size, or emplacement mechanism. Volcanologists also refer to airborne fragments as pyroclasts. Once clasts have fallen to the ground, they remain as tephra unless hot enough to fuse into pyroclastic rock or tuff. Tephrochronology is a geochronological technique that uses discrete layers of tephra—volcanic ash from a single eruption—to create a chronological framework in which paleoenvironmental or archaeological records can be placed. When a volcano explodes, it releases a variety of tephra including ash, cinders, and blocks. These layers settle on the land and, over time, sedimentation occurs incorporating these tephra layers into the geologic record. Often, when a volcano explodes, biological organisms are killed and their remains are buried within the tephra layer. These fossils are later dated by scientists to determine the age of the fossil and its place within the g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stratovolcanoes Of Japan
A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava and tephra. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with a summit crater and periodic intervals of explosive eruptions and effusive eruptions, although some have collapsed summit craters called calderas. The lava flowing from stratovolcanoes typically cools and hardens before spreading far, due to high viscosity. The magma forming this lava is often felsic, having high-to-intermediate levels of silica (as in rhyolite, dacite, or andesite), with lesser amounts of less-viscous mafic magma. Extensive felsic lava flows are uncommon, but have travelled as far as . Stratovolcanoes are sometimes called composite volcanoes because of their composite stratified structure, built up from sequential outpourings of erupted materials. They are among the most common types of volcanoes, in contrast to the less common shield vol ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Active Volcanoes
An active volcano is a volcano which is either erupting or is likely to erupt in the future. An active volcano which is not currently erupting is known as a dormant volcano. Overview Tlocene Epoch. Most volcanoes are situated on the Pacific Ring of Fire. An estimated 500 million people live near active volcanoes. ''Historical time'' (or recorded history) is another timeframe for ''active''. However, the span of recorded history differs from region to region. In China and the Mediterranean, it reaches back nearly 3,000 years, but in the Pacific Northwest of the United States and Canada, it reaches back less than 300 years, and in Hawaii and New Zealand it is only around 200 years. The incomplete ''Catalogue of the Active Volcanoes of the World'', published in parts between 1951 and 1975 by the International Association of Volcanology, uses this definition, by which there are more than 500 active volcanoes. , the Smithsonian Global Volcanism Program recognizes 560 volcanoes with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanoes Of Akita Prefecture
A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. On Earth, volcanoes are most often found where tectonic plates are diverging or converging, and most are found underwater. For example, a mid-ocean ridge, such as the Mid-Atlantic Ridge, has volcanoes caused by divergent tectonic plates whereas the Pacific Ring of Fire has volcanoes caused by convergent tectonic plates. Volcanoes can also form where there is stretching and thinning of the crust's plates, such as in the East African Rift and the Wells Gray-Clearwater volcanic field and Rio Grande rift in North America. Volcanism away from plate boundaries has been postulated to arise from upwelling diapirs from the core–mantle boundary, deep in the Earth. This results in hotspot volcanism, of which the Hawaiian hotspot is an example. Volcanoes are usually not created where two tectonic plate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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 prominence, the following list is provided for convenience only. See also * List of Japanese prefectures by highest mountain References External links Mt. Nakanodake：Hiking route｜Snow Country* * Japan 100 Mountains {{DEFAULTSORT:List Of Mountains And Hills Of Japan By Height Mountains of Japan Height Height is measure of vertical distance, either vertical extent (how "tall" something or someone is) or vertical position (how "high" a point is). For example, "The height of that building is 50 m" or "The height of an airplane in-flight is ab ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanic Tremor
A harmonic tremor is a sustained release of seismic and infrasonic energy typically associated with the underground movement of magma, the venting of volcanic gases from magma, or both. It is a long-duration release of seismic energy, with distinct spectral lines, that often precedes or accompanies a volcanic eruption. More generally, a volcanic tremor is a sustained signal that may or may not possess these harmonic spectral features. Being a long-duration continuous signal from a temporally extended source, a volcanic tremor contrasts distinctly with transient sources of seismic radiation, such as tremors that are typically associated with earthquakes and explosions. The relation between long-period events and an imminent eruption was first observed by Bernard Chouet, a volcanologist who was working at the United States Geological Survey.U.S. TV program on use of long-period events to predict volcanic eruptions: "Nova: Volcano's Deadly Warning": https://www.pbs.org/wgbh/nova ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mudflow
A mudflow or mud flow is a form of mass wasting involving fast-moving flow of debris that has become liquified by the addition of water. Such flows can move at speeds ranging from 3 meters/minute to 5 meters/second. Mudflows contain a significant proportion of clay, which makes them more fluid than debris flows, allowing them to travel farther and across lower slope angles. Both types of flow are generally mixtures of particles with a wide range of sizes, which typically become sorted by size upon deposition. Mudflows are often called mudslides, a term applied indiscriminately by the mass media to a variety of mass wasting events. Mudflows often start as slides, becoming flows as water is entrained along the flow path; such events are often called flow slides. Other types of mudflows include lahars (involving fine-grained pyroclastic deposits on the flanks of volcanoes) and jökulhlaups (outbursts from under glaciers or icecaps). A statutory definition of "flood-related muds ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Japan
Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north toward the East China Sea, Philippine Sea, and Taiwan in the south. Japan is a part of the Ring of Fire, and spans Japanese archipelago, an archipelago of List of islands of Japan, 6852 islands covering ; the five main islands are Hokkaido, Honshu (the "mainland"), Shikoku, Kyushu, and Okinawa Island, Okinawa. Tokyo is the Capital of Japan, nation's capital and largest city, followed by Yokohama, Osaka, Nagoya, Sapporo, Fukuoka, Kobe, and Kyoto. Japan is the List of countries and dependencies by population, eleventh most populous country in the world, as well as one of the List of countries and dependencies by population density, most densely populated and Urbanization by country, urbanized. About three-fourths of Geography of Japan, the c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hot Spring
A hot spring, hydrothermal spring, or geothermal spring is a spring produced by the emergence of geothermally heated groundwater onto the surface of the Earth. The groundwater is heated either by shallow bodies of magma (molten rock) or by circulation through faults to hot rock deep in the Earth's crust. In either case, the ultimate source of the heat is radioactive decay of naturally occurring radioactive elements in the Earth's mantle, the layer beneath the crust. Hot spring water often contains large amounts of dissolved minerals. The chemistry of hot springs ranges from acid sulfate springs with a pH as low as 0.8, to alkaline chloride springs saturated with silica, to bicarbonate springs saturated with carbon dioxide and carbonate minerals. Some springs also contain abundant dissolved iron. The minerals brought to the surface in hot springs often feed communities of extremophiles, microorganisms adapted to extreme conditions, and it is possible that life on Earth h ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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