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 1855 Ansei Edo earthquake

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Registration date : 2010-10-29

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PostSubject: 1855 Ansei Edo earthquake   1855 Ansei Edo earthquake Icon_minitimeSun Nov 07, 2010 8:06 am

The 1855 Ansei Edo earthquake (安政江戸地震, Ansei Edo Jishin?), also known as the Great Ansei Earthquake, was one of the major disasters of the late-Edo period.[3] The earthquake occurred at 22:00 local time on 11 November. It had an epicenter close to Edo (now Tokyo), causing considerable damage in the Kantō region from the shaking and subsequent fires, with a death toll of about 7,000 people.[2] The earthquake had a magnitude of 7.0 on the surface wave magnitude scale and reached a maximum intensity of XI (Extreme) on the Mercalli intensity scale.[1][4] The earthquake triggered a minor tsunami.
The Kanto area lies above a complex part of the convergent boundaries between the subducting Pacific and Philippine Sea Plates and the overriding Eurasian Plate. Earthquakes with epicenters in the Kanto region may occur within the Eurasian Plate, at the Eurasaian Plate/Philippine Sea Plate interface, within the Philippine Sea Plate, at the Philippine Sea Plate/Pacific Plate interface or within the Pacific Plate. In addition to this set of major plates it has been suggested that there is also a separate 25 km thick, 100 km wide body, a fragment of Pacific Plate lithosphere.[5] The 1855 earthquake is consistent with a rupture along the interface between the Eurasian and Philippine Sea Plates, adjacent to, and down dip from, the rupture that caused the 1923 Great Kantō earthquake.[6]

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