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Eastern Margin Of The Sea Of Japan
The eastern margin of the Sea of Japan is a zone of concentrated geological strain which extends several hundred kilometers and north–south along the eastern margin of the Sea of Japan. The margin has undergone convergence tectonics since the end of the Pliocene. It is believed to be an incipient subduction zone which defines the tectonic boundary between the Amurian Plate, Amurian and Okhotsk Plate, Okhotsk plates. This geological zone is seismically active and has been the source of destructive tsunamis. The feature runs off the west coast of Honshu, passes west of the Shakotan Peninsula on Hokkaido and through the Strait of Tartary, between Sakhalin and mainland Russia. Plate tectonics The Sea of Japan represents a back-arc basin that formed via geological rifting of continental crust from the late Oligocene to middle Miocene (28–13 million years ago). The Sea of Japan can be divided into sub-basins; the Japan Basin, Yamato Basin and Tsushima Basin. Seafloor spreading in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seismicity Of Eastern Margin Of The Japan Sea 1
Seismicity is a measure encompassing earthquake occurrences, mechanisms, and Richter magnitude scale, magnitude at a given Geography, geographical location. As such, it summarizes a region's seismic activity. The term was coined by Beno Gutenberg and Charles Francis Richter in 1941. Seismicity is studied by Geophysics, geophysicists. Calculation of seismicity Seismicity is quantitatively computed. Generally, the region under study is divided in equally sized areas defined by latitude and longitude, and the Earth's structure, Earth's interior is divided into various depth intervals on account of Earth, Earth's Stratum, layering: Up to depth, , and > . The usual formula to calculate seismicity is: S = \frac where : _i: is the energy of a single seismic event (i.e., earthquake); : _0: interval of latitude; : _0: interval of longitude : _0: interval of the hypocenter; : _0: interval of the time of the seismic event. : The result is seismicity as energy per cubic unit. See als ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seafloor Spreading
Seafloor spreading, or seafloor spread, is a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge. History of study Earlier theories by Alfred Wegener and Alexander du Toit of continental drift postulated that continents in motion "plowed" through the fixed and immovable seafloor. The idea that the seafloor itself moves and also carries the continents with it as it spreads from a central rift axis was proposed by Harold Hammond Hess from Princeton University and Robert Dietz of the U.S. Naval Electronics Laboratory in San Diego in the 1960s. The phenomenon is known today as plate tectonics. In locations where two plates move apart, at mid-ocean ridges, new seafloor is continually formed during seafloor spreading. Significance Seafloor spreading helps explain continental drift in the theory of plate tectonics. When oceanic plates diverge, tensional stress causes fractures to occur i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tōhoku Region
The , Northeast region, , or consists of the northeastern portion of Honshu, the largest island of Japan. This traditional region consists of six prefectures (): Akita, Aomori, Fukushima, Iwate, Miyagi, and Yamagata. Tōhoku retains a reputation as a remote, scenic region with a harsh climate. In the 20th century, tourism became a major industry in the Tōhoku region. History Ancient and classical period In mythological times, the area was known as Azuma (, ) and corresponded to the area of Honshu occupied by the native Emishi and Ainu. The area was historically the Dewa and the Michinoku regions, a term first recorded in (654). There is some variation in modern usage of the term "Michinoku". Tōhoku's initial historical settlement occurred between the seventh and ninth centuries, well after Japanese civilization and culture had become firmly established in central and southwestern Japan. The last stronghold of the indigenous Emishi on Honshu and the site of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oshima Peninsula
The Oshima Peninsula (渡島 半島 ''Oshima-hantō'') is the southernmost part of Hokkaidō, the northernmost of the Japanese islands. Where the peninsula starts is open to interpretation. A more generous interpretation is to draw a line southeast from Ishikari Bay across the Ishikari Plain to Yūfutsu District, Hokkaido. A narrower interpretation is to draw a line connecting Suttsu on the Sea of Japan and Oshamambe on Uchiura Bay. This narrow interpretation encompasses the subprefectures of Oshima and Hiyama. At its southern end it forks into the southwest-pointing Matsumae Peninsula and the southeast-pointing Kameda Peninsula. These two peninsulas face Tsugaru and Shimokita Peninsulas of Honshū across the Tsugaru Strait. The Ōnuma Quasi-National Park is located on the peninsula. The terrain of the peninsula is mountainous, with settlements mostly located in flat, lowland areas. Oshima Peninsula is home to several active volcanoes such as Mount E and Hokkaido Koma- ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Okhotsk Plate Map En
Okhotsk ( rus, Охотск, p=ɐˈxotsk) is an urban locality (a work settlement) and the administrative center of Okhotsky District of Khabarovsk Krai, Russia, located at the mouth of the Okhota River on the Sea of Okhotsk. Population: Etymology It was named after the Okhota River, whose name is a corrupted Evenk word ''okat'', "river". History Okhotsk was the main Russian base on the Pacific coast from about 1650 to 1860, but lost its importance after the Amur Annexation in 1860. It is located at the east end of the Siberian River Routes on the Sea of Okhotsk where the Okhota and Kukhtuy rivers join to form a poor-but-usable harbor. In 1639, the Russians first reached the Pacific southwest of Okhotsk at the mouth of the Ulya River. In 1647, Semyon Shelkovnikov built winter quarters at Okhotsk. In 1649, a fort was built (Kosoy Ostrozhok). In 1653, Okhotsk was burned by the local Lamuts. Although the Russian pioneers were skilled builders of river boats, they lacked th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Collision Zone
A collision zone occurs when tectonic plates meet at a convergent boundary both bearing continental lithosphere. As continental lithosphere is usually not subducted due to its relatively low density, the result is a complex area of orogeny involving folding and thrust faulting as the blocks of continental crust ''pile up'' above the subduction zone. This includes the Eastern Anatolian collision zone and Banda Arc–Australian collision zone.Karig, Daniel E., et al., ''Nature and distribution of deformation across the Banda Arc–Australian collision zone at Timor,'' GSA Bulletin; January 1987; v. 98; no. 1; pp. 18–32 See also *List of tectonic plate interactions Tectonic plate interactions are classified into three basic types: * Convergent boundaries are areas where plates move toward each other and collide. These are also known as compressional or destructive boundaries. ** Obduction zones occ ... References Tectonics {{tectonics-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Transform Fault
A transform fault or transform boundary, is a fault (geology), fault along a plate boundary where the motion (physics), motion is predominantly Horizontal plane, horizontal. It ends abruptly where it connects to another plate boundary, either another transform, a spreading ridge, or a subduction, subduction zone. A transform fault is a special case of a ''strike-slip fault'' that also forms a plate boundary. Most such faults are found in oceanic crust, where they accommodate the lateral offset between segments of Divergent boundary, divergent boundaries, forming a zigzag pattern. This results from oblique seafloor spreading where the direction of motion is not perpendicular to the trend of the overall divergent boundary. A smaller number of such faults are found on land, although these are generally better-known, such as the San Andreas Fault and North Anatolian Fault. Nomenclature Transform boundaries are also known as conservative plate boundaries because they involve no addit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1983 Sea Of Japan Earthquake
1983 saw both the official beginning of the Internet and the first mobile cellular telephone call. Events January * January 1 – The migration of the ARPANET to TCP/IP is officially completed (this is considered to be the beginning of the true Internet). * January 6 – Pope John Paul II appoints a bishop over the Czechoslovak exile community, which the ''Rudé právo'' newspaper calls a "provocation." This begins a year-long disagreement between the Czechoslovak Socialist Republic and the Vatican, leading to the eventual restoration of diplomatic relations between the two states. * January 14 – The head of Bangladesh's military dictatorship, Hussain Muhammad Ershad, announces his intentions to "turn Bangladesh into an Islamic state." * January 18 – U.S. Secretary of the Interior James G. Watt makes controversial remarks blaming poor living conditions on Native American reservations on "the failures of socialism." Watt will eventually resign in September after a series o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Niigata Prefecture
is a Prefectures of Japan, prefecture in the Chūbu region of Honshu of Japan. Niigata Prefecture has a population of 2,131,009 (1 July 2023) and is the List of Japanese prefectures by area, fifth-largest prefecture of Japan by geographic area at . Niigata Prefecture borders Toyama Prefecture and Nagano Prefecture to the southwest, Gunma Prefecture to the south, Fukushima Prefecture to the east, and Yamagata Prefecture to the northeast. Niigata, Niigata, Niigata is the capital and largest city of Niigata Prefecture, with other major cities including Nagaoka, Niigata, Nagaoka, Jōetsu, Niigata, Jōetsu, and Sanjō, Niigata, Sanjō. Niigata Prefecture contains the Niigata Major Metropolitan Area centered on Niigata with a population of 1,395,612, the largest metropolitan area on the Sea of Japan coast and the twelfth-largest in Japan. Niigata Prefecture is part of the historic Hokuriku region and features Sado Island, the sixth largest island of Japan in area following the List o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tectonophysics (journal)
''Tectonophysics, The International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth'' is a weekly peer-reviewed scientific journal published by Elsevier. It was established in 1964 and covers the field of tectonophysics, including kinematics, structure, composition, and dynamics of the solid Earth at all scales. Organization The editors-in-chief are Samuel Angiboust ( ENS de Lyon), Jean-Philippe Avouac (California Institute of Technology), Ramon Carbonell (Spanish National Research Council), Rob Govers (Utrecht University), Zheng Xiang Li (Curtin University), and Kelin Wang (Geological Survey of Canada). Abstracting and indexing This journal is abstracted and indexed in over fifty databases, including Current Contents, GeoRef, Inspec, Scopus and Web of Science. Notable articles According to the ''Journal Citation Reports'', ''Tectonophysics'' has a 2011 impact factor The impact factor (IF) or journal impact factor (JIF) of an academic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wadati–Benioff Zone
A Wadati–Benioff zone (also Benioff–Wadati zone or Benioff zone or Benioff seismic zone) is a planar zone of seismicity corresponding with the down-going slab in a subduction zone. Differential motion along the zone produces numerous earthquakes, the foci of which may be as deep as about . The term was named for the two seismologists, Hugo Benioff of the California Institute of Technology and Kiyoo Wadati of the Japan Meteorological Agency, who independently discovered the zones. Wadati–Benioff zone earthquakes develop beneath volcanic island arcs and continental margins above active subduction zones. They can be produced by slip along the subduction thrust fault or slip on faults within the downgoing plate, as a result of bending and extension as the plate is pulled into the mantle. The deep-focus earthquakes along the zone allow seismologists to map the three-dimensional surface of a subducting slab of oceanic crust and mantle. Discovery In 1949, Hugo Benioff ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Strike-slip Tectonics
Strike-slip tectonics or wrench tectonics is a type of tectonics that is dominated by lateral (horizontal) movements within the Earth's crust (and lithosphere). Where a zone of strike-slip tectonics forms the boundary between two tectonic plates, this is known as a transform or conservative plate boundary. Areas of strike-slip tectonics are characterised by particular deformation styles including: ''stepovers'', ''Riedel shears'', ''flower structures'' and ''strike-slip duplexes''. Where the displacement along a zone of strike-slip deviates from parallelism with the zone itself, the style becomes either transpressional or transtensional depending on the sense of deviation. Strike-slip tectonics is characteristic of several geological environments, including oceanic and continental transform faults, zones of oblique collision and the deforming foreland of zones of continental collision. Deformation styles Stepovers When strike-slip fault zones develop, they typically form as sev ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
