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Longgang Volcanic Field
Longgang is a volcanic field in Jilin Province, China. It is also known as Chingyu, Longwan Group or Lung-wan Group. This volcanic field contains over 164 individual centres in the form of crater lakes, maars and volcanic cones and covers a surface area of . The field is forested and mostly undisturbed by human activities. Longgang is located in an area of northeast China where the subduction of the Pacific Plate beneath the Eurasian Plate, along with other tectonic processes triggers volcanic activity. Some other volcanoes are found in the region, most importantly Changbaishan volcano which is found in the neighbouring Changbaishan volcanic field (120km to the East). Volcanic activity in the field goes back to the Pleistocene. Jinlongdingzi cone suffered a major Plinian eruption in 350 AD or 460 AD, which was accompanied by ash fall and the extrusion of a lava flow. Future volcanic activity in the field may result in hazardous Plinian eruptions. Geography and geological con ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Volcanic Field
A volcanic field is an area of Earth's crust that is prone to localized volcanic activity. The type and number of volcanoes required to be called a "field" is not well-defined. Volcanic fields usually consist of clusters of up to 100 volcanoes such as cinder cones. Lava flows may also occur. They may occur as a monogenetic volcanic field or a polygenetic volcanic field. Description Alexander von Humboldt observed in 1823 that geologically young volcanoes are not distributed uniformly across the Earth's surface, but tend to be clustered into specific regions. Young volcanoes are rarely found within cratons, but are characteristic of subduction zones, rift zones, or in ocean basins. Intraplate volcanoes are clustered along hotspot traces. Within regions of volcanic activity, volcanic fields are clusters of volcanoes that share a common magma source. Scoria cones are particularly prone to cluster into volcanic fields, which are typically in diameter and consist of several tens ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geothermal Energy
Geothermal energy is the thermal energy in the Earth's crust which originates from the formation of the planet and from radioactive decay of materials in currently uncertain but possibly roughly equal proportions. The high temperature and pressure in Earth's interior cause some rock to melt and solid mantle to behave plastically. This results in parts of the mantle convecting upward since it is lighter than the surrounding rock. Temperatures at the core–mantle boundary can reach over 4000 °C (7200 °F). Geothermal heating, using water from hot springs, for example, has been used for bathing since Paleolithic times and for space heating since ancient Roman times. More recently geothermal power, the term used for generation of electricity from geothermal energy, has gained in importance. It is estimated that the earth's geothermal resources are theoretically more than adequate to supply humanity's energy needs, although only a very small fraction is currently being ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cinder Cone
A cinder cone (or scoria cone) is a steep conical hill of loose pyroclastic fragments, such as volcanic clinkers, volcanic ash, or scoria that has been built around a volcanic vent. The pyroclastic fragments are formed by explosive eruptions or lava fountains from a single, typically cylindrical, vent. As the gas-charged lava is blown violently into the air, it breaks into small fragments that solidify and fall as either cinders, clinkers, or scoria around the vent to form a cone that often is symmetrical; with slopes between 30 and 40°; and a nearly circular ground plan. Most cinder cones have a bowl-shaped crater at the summit. Mechanics of eruption Cinder cones range in size from tens to hundreds of meters tall and often have a bowl-shaped crater at the summit. They are composed of loose pyroclastic material (cinder or scoria), which distinguishes them from ''spatter cones'', which are composed of agglomerated volcanic bombs. The pyroclastic material making up a cinder ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lava Flow
Lava is molten or partially molten rock (magma) that has been expelled from the interior of a terrestrial planet (such as Earth) or a moon onto its surface. Lava may be erupted at a volcano or through a fracture in the crust, on land or underwater, usually at temperatures from . The volcanic rock resulting from subsequent cooling is also often called ''lava''. A lava flow is an outpouring of lava during an effusive eruption. (An explosive eruption, by contrast, produces a mixture of volcanic ash and other fragments called tephra, not lava flows.) The viscosity of most lava is about that of ketchup, roughly 10,000 to 100,000 times that of water. Even so, lava can flow great distances before cooling causes it to solidify, because lava exposed to air quickly develops a solid crust that insulates the remaining liquid lava, helping to keep it hot and inviscid enough to continue flowing. The word ''lava'' comes from Italian and is probably derived from the Latin word ''labes'', ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fault (geology)
In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust result from the action of plate tectonic forces, with the largest forming the boundaries between the plates, such as the megathrust faults of subduction zones or transform faults. Energy release associated with rapid movement on active faults is the cause of most earthquakes. Faults may also displace slowly, by aseismic creep. A ''fault plane'' is the plane that represents the fracture surface of a fault. A ''fault trace'' or ''fault line'' is a place where the fault can be seen or mapped on the surface. A fault trace is also the line commonly plotted on geologic maps to represent a fault. A ''fault zone'' is a cluster of parallel faults. However, the term is also used for the zone of crushed rock along a single fault. Prolonged motion along closely spaced faults can blur the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Slab (geology)
In geology, the slab is a significant constituent of subduction zones . Subduction slabs drive plate tectonics by pulling along the lithosphere to which they attach in a process known as slab pull and by inducing currents in the mantle via slab suction. The slab affects the convection and evolution of the Earth's mantle due to the insertion of the hydrous oceanic lithosphere. Dense oceanic lithosphere retreats into the Earth's mantle, while lightweight continental lithospheric material produces active continental margins and volcanic arcs, generating volcanism. Recycling the subducted slab presents volcanism by flux melting from the mantle wedge. The slab motion can cause dynamic uplift and subsidence of the Earth's surface, forming shallow seaways and potentially rearranging drainage patterns. Geologic features of the subsurface can infer subducted slabs by seismic imaging. Subduction slabs are dynamic; slab characteristics such as slab temperature evolution, flat-slab, d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seismic Tomography
Seismic tomography or seismotomography is a technique for imaging the subsurface of the Earth with seismic waves produced by earthquakes or explosions. P-, S-, and surface waves can be used for tomographic models of different resolutions based on seismic wavelength, wave source distance, and the seismograph array coverage. The data received at seismometers are used to solve an inverse problem, wherein the locations of reflection and refraction of the wave paths are determined. This solution can be used to create 3D images of velocity anomalies which may be interpreted as structural, thermal, or compositional variations. Geoscientists use these images to better understand core, mantle, and plate tectonic processes. Theory Tomography is solved as an inverse problem. Seismic travel time data are compared to an initial Earth model and the model is modified until the best possible fit between the model predictions and observed data is found. Seismic waves would travel in straight lines ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wudalianchi
Wudalianchi (), formerly Dedu County (), is a county-level city in Heilongjiang province, China. It is under the jurisdiction of the prefecture-level city of Heihe. It contains a volcanic field. The city's name means "five joint ponds" and refers to a set of interconnected lakes formed after the eruption of the volcanoes of Laoheishan (, means "Old Black Mountain") and Huoshaoshan (, means "Fire Burn Mountain") in 1720–21. The city is served by Wudalianchi Dedu Airport. Administrative divisions Wudalianchi City is divided into 1 subdistrict, 7 towns and 4 townships. ;1 subdistrict * Qingshan () ;7 towns * Long (), Heping (), Wudalianchi (), Shuangquan (), Xinfa (), Tuanjie (), Xinglong () ;4 townships * Jianshe (), Taiping (), Xing'an (), Zhaoyang () Demographics The population of the district was in 1999.National Population Statistics Materials by County and City - 1999 Period, ''in'China County & City Population 1999, Harvard China Historical GIS/ref> Clim ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Keluo
Keluo (Chinese: , p ''Kēluò'') is a dormant volcanic field north-by-northwest of Daquijin in northeastern China. It is located at an intersection of regional lineaments trending northeast and northwest; the volcanoes were erupted through basement igneous and sedimentary rocks from the Jurassic to Cretaceous, through granite, and through pre-Permian metasediments. Like the Wudalianchi volcanic to its south, it contains high-potassium basaltic cinder cones.''VolcanoDiscovery''.Keluo volcano. Accessed 25 July 2014. The field possesses 23 cones over an area of . There are reports of historical activity, but these remain unconfirmed. The morphology of a number of the conesincluding Nanshan (), Gushan (), Jianshan (), Dayishan (), and Xiaoyishan ()suggests their formation during the last 10,000 years (the Holocene). Most cones to the northeast, however, probably date from the Pleistocene to the Tertiary. Other peaks include Dangzishan, Heishan, and Muhenanshan. See also ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jingpo Lake
Jingpo Lake or Lake Jingpo (; ''Pinyin'': Jìng Pō Hú) is a lakes of China, lake located in the upper reaches of the Mudan River among the Wanda Mountains in Ningan County, Heilongjiang Province, in the People's Republic of China. Earlier names for the lake include ( zh, labels=no, 湄沱湖), ( zh, labels=no, 忽汗海), and (Manchurian: ; zh, 畢爾騰湖). The length of the lake from north to south is and the widest distance between east and west is only . The area is and the storage capacity is 1.63 billion m3. The south part of lake is shallow with the deepest place in the northern part at . The winter average temperature in Heilongjiang Province is below -20°C (-4°F), but the temperature at the bottom of the water is always above 10°C (50°F). On Titan (moon), Titan, the largest moon of the planet Saturn, there is a large surface body of liquid hydrocarbons, Jingpo Lacus, named after Jingpo Lake. Formation The lake was created about 10,000 years ago when the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
