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1964 Niigata earthquake
The 1964 Niigata earthquake struck at 13:01 local time (04:01 UTC) on 16 June with a magnitude of 7.5 or 7.6. The epicenter was on the continental shelf off the northwest coast of Honshu, Japan in Niigata Prefecture, about north of the city of Niigata. The earthquake caused liquefaction over large parts of the city.
==Geology==
The northwestern side of Honshu lies on the southeastern margin of the Sea of Japan, an area of oceanic crust created by back-arc spreading from the late Oligocene to middle Miocene. The extensional tectonics associated with the spreading formed a series of N-S trending extensional faults and associated basins. Currently the area is being deformed by contractional tectonics, causing inversion of these earlier basins, forming anticlinal structures. The earthquake is thought to have occurred due to reverse movement on one of these reactivated faults.〔
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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