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13-839: Japan's principal fault system is the zone where the Amurian microplate , the Eastern edge of the Eurasian plate, meets the Okhotsk microplate, sometimes considered the Western edge of the North American plate . It is controversial whether the northern Honshu, Okhotsk and North American plate constitute separate blocks or plates. "A slightly better fit to data is obtained" when the proposed blocks, Honshu and Okhotsk, are independent of North America, so some studies make this an assumption of their analysis. The boundary

26-770: A plate boundary that passed through Hokkaido during the Neogene . Under their proposal, northeastern Japan and western Hokkaido would have been part of the Eurasian plate in the Neogene. The boundary between Okhotsk microplate and Amurian microplate might be responsible for many strong earthquakes that occurred in the Sea of Japan as well as in Sakhalin Island, such as the M W 7.1 ( M S 7.5 according to other sources) earthquake of May 27, 1995 in northern Sakhalin. The earthquake devastated

39-680: Is a left-lateral moving transform fault , the Ulakhan Fault originating from a triple junction in the Chersky Range . During the 1970s Japan was thought to be located on the Eurasian plate at a quadruple junction with the North American plate, the Pacific plate and the Philippines Plate. At that time the western boundary of the North American plate was drawn through southern Hokkaido . In

52-568: Is a division within the Eurasian plate, with an unknown western boundary, defined on the south by the Qinling suture zone in central China and the Baikal Rift Zone and Stanovoy Mountains on the north. The Baikal Rift Zone is considered a boundary between the Amurian Plate and the Eurasian plate. GPS measurements indicate that the plate is slowly rotating counterclockwise. The boundary with

65-768: Is bounded on the north, west, and southwest by the Eurasian plate , on the east by the Okhotsk microplate , to the southeast by the Philippine Sea plate along the Suruga Trough and the Nankai Trough , and the Okinawa plate , and the Yangtze plate . The Amurian Plate may have been involved in the 1975 Haicheng earthquake and the 1976 Tangshan earthquake in China. The Amurian microplate

78-605: The South China block or the South China subplate , comprises the bulk of southern China . It is separated on the east from the Okinawa plate by a rift that forms the Okinawa Trough which is a back-arc basin , on the south by the Sunda plate and the Philippine Sea plate , and on the north and west by the Eurasian plate . The Longmenshan Fault on the latter border was the site of the 2008 Wenchuan earthquake . The Yangtze plate

91-581: The "North America or Okhotsk plate". Amurian microplate The Amurian microplate (or Amur microplate ; also occasionally referred to as the China plate , not to be confused with the Yangtze plate ) is a minor tectonic plate in the northern and eastern hemispheres. The Amurian Plate is named after the Amur River , which forms the border between the Russian Far East and Northeast China . It

104-680: The 1980s, the boundary of the North American plate was extended to the Japan Sea and the Itoigawa-Shizuoka Tectonic Line (I-STL) due to earthquakes occurring at the eastern edge of the Japan Sea. 1990s research supported a proposal of an Okhotsk microplate independent from the North American plate. The Southern boundary through I-STL was proposed by Peter Bird in 2003 and places Japan on the Okhotsk Plate. Other researchers have proposed

117-510: The Okhotsk Plate is the eastern margin of the Sea of Japan . It covers northeastern China , the Korean Peninsula , the Sea of Japan , Shikoku , Kyushu , southwest Honshu ( Kansai , Chūgoku ), eastern Mongolia and the south of Russian Far East . This tectonics article is a stub . You can help Misplaced Pages by expanding it . Yangtze plate The Yangtze plate , also called

130-466: The Okhotsk microplate is slowly rotating in a clockwise direction. Models indicate that it rotates 0.2 deg/Myr about a pole located north of Sakhalin . In 2011 a M w  9.0–9.1 undersea megathrust earthquake caused by the subduction of the Pacific plate below the Okhotsk microplate. The worst effected areas in Tohoku, Japan experienced around six minutes of shaking . The main slip occurred at

143-600: The largest on world record, including the Kamchatka earthquakes of 1737 (estimated M9.0~9.3) and 1952 (M9.0). Such strong megathrust earthquakes can also occur near the Kuril Islands , as the M8.3 earthquake of November 15, 2006, Hokkaido , as the M8.3 earthquake of September 26, 2003 and the M9.0 2011 Tōhoku earthquake off the coast of Honshu . GPS measurements and other studies show that

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156-439: The town of Neftegorsk , which was not rebuilt afterwards. Other notable intraplate earthquakes , such as the 1983 Sea of Japan earthquake and the 1993 Hokkaidō earthquake , have triggered tsunamis in the Sea of Japan. The boundary between Okhotsk microplate and Pacific plate is a subduction zone, where the Pacific plate subducts beneath the Okhotsk Plate. Many strong megathrust earthquakes occurred here, some of them among

169-654: Was formed by the disaggregation of the Rodinia supercontinent 750 million years ago, in the Neoproterozoic era . South China rifted away from the Gondwana supercontinent in the Silurian . During the formation of the great supercontinent Pangaea , South China was a smaller, separate continent located off the east coast of the supercontinent and drifting northward. In the Triassic ,

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