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1700 Cascadia earthquake
The 1700 Cascadia earthquake occurred along the Cascadia subduction zone on January 26 with an estimated moment magnitude of 8.7–9.2. The megathrust earthquake involved the Juan de Fuca Plate that underlies the Pacific Ocean, from mid-Vancouver Island in British Columbia, Canada, south along the Pacific Northwest coast as far as northern California. The length of the fault rupture was about with an average slip of .
The earthquake caused a tsunami that struck the coast of Japan,〔(【引用サイトリンク】 title=The Orphan Tsunami of 1700—Japanese Clues to a Parent Earthquake in North America ) USGS Professional Paper 1707〕 and may also be linked to the Bonneville Slide and the Tseax Cone eruption in British Columbia.
==Evidence==
Evidence supporting the occurrence of the 1700 earthquake has been gathered into the 2005 book ''The Orphan Tsunami of 1700'', by Brian Atwater, Kenji Satake, David Yamaguchi, and others.
The evidence suggests that it took place at about 21:00 on January 26, 1700 (NS). Although there were no written records in the region at the time, the earthquake's precise time is nevertheless known from Japanese records of a tsunami that has not been tied to any other Pacific Rim earthquake. The Japanese records exist primarily in the prefecture of Iwate, in communities such as Tsugaruishi, Kuwagasaki and Ōtsuchi.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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