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1965 Olympia earthquake : ウィキペディア英語版 | 1965 Olympia earthquake
|magnitude = 6.7 Mw 〔 |depth = 59 km 〔 |location = |countries affected = (Washington) United States |aftershocks = None |damage = 12.5 million 〔 |intensity = VIII (''Severe'') |PGA = .204''g'' at Olympia |casualties = 7 dead }} The 1965 Olympia earthquake occurred at 08:29 PDT (15:29 UTC) on April 29 within the Puget Sound region of Washington State. It had a magnitude of 6.7 on the moment magnitude scale and a maximum perceived intensity of VIII (''Severe'') on the Mercalli intensity scale. It caused the deaths of seven people and about $12.5 million in damage.〔(【引用サイトリンク】title=Significant earthquake )〕 There were no recorded aftershocks. ==Tectonic setting==
The western part of Washington State lies above the Cascadia subduction zone, where the Juan de Fuca Plate is being subducted beneath the North American Plate. The seismicity of this region consists of rare great megathrust earthquakes, like the 1700 Cascadia earthquake and more common earthquakes originating from within the subducting slab. These events relate to normal faulting, associated with the bending of the slab, possibly related to a phase change below about 40 km from basalt/gabbro to eclogite.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「1965 Olympia earthquake」の詳細全文を読む
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