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1968 Tokachi earthquake : ウィキペディア英語版 | 1968 Tokachi earthquake
The 1968 Tokachi earthquake (1968年十勝沖地震 ''Sen-kyūhyaku-rokujūhachi-nen Tokachi-oki Jishin'') occurred on May 16 at 0:49 UTC (09:49 local time) in the area offshore Aomori and Hokkaido. The magnitude of this earthquake was put at Mw 8.3.〔 The intensity of the earthquake reached shindo 5 in Aomori, Aomori and Hakodate, Hokkaido.〔(Tsunami forecast Archives )〕 ==Geology== This earthquake was located near the junction of the Kuril Trench and the Japan Trench. It is an interplate earthquake. The focal mechanism of this earthquake shows movement on a thrust fault with a considerable slip-strike component. The sum of interplate seismic moment release by seismic and aseismic faulting in this earthquake is about 28×1020 N m. The 1960s was noted as one of the peak periods of interplate seismic moment release in the offshore Sanriku region.〔"Space-time distribution of interplate moment release including slow earthquakes and the seismo-geodetic coupling in the Sanriku-oki region along the Japan trench" by I. Kawasaki, Y. Asai, and Y. Tamura〕
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