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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク 1994 offshore Sanriku earthquake ： ウィキペディア英語版 1994 offshore Sanriku earthquake The 1994 offshore Sanriku earthquake (Japanese: 三陸はるか沖地震 ''Sanriku Haruka Okijishin'') occurred on December 28, 1994 at 12:19 UTC (21:19 local time). This was a magnitude Mw 7.7 earthquake with epicenter located in the Pacific Ocean at about 180 km east of Hachinohe, Aomori (''haruka-oki'' means "far offshore"). Three people were reported dead and more than 200 injured;〔(【引用サイトリンク】title=Comments for the Significant Earthquake )〕 48 houses were completely destroyed. Road damage and power outages were reported. Liquefaction occurred in the Hachinohe Port area. The intensity reached shindo 6 in Hachinohe, Aomori, about 187.6 km from epicenter. It could be felt in Tokyo, about 632.9 km from epicenter, with shindo 2.〔http://www.seisvol.kishou.go.jp/eq/kyoshin/jishin/sanrikuharukaoki/table.htm〕 The Japanese Meteorological Agency put the magnitude at Mjma 7.5. Slip associated with this earthquake continued for more than a year and it has been termed an 'ultra-slow earthquake'.〔 == Geology == The northern part of Honshu and Hokkaido lie above the convergent plate boundary, where the Pacific Plate is subducting beneath the Okhotsk Plate. The convergence rate across this boundary lies in the range of 7.9–9.2 cm per year. The plate interface in the area of the earthquake epicenter shows an abrupt increase in dip from about 5° to about 15°, 80 km landward of the Japan Trench. This part of the plate boundary has been the location of many powerful historical earthquakes, dating back to the 869 Sanriku earthquake and most recently of the devastating 2011 Tōhoku earthquake. Most of these events relate to rupture along the plate interface, but some, such as the 1933 Sanriku earthquake, involved deformation within the subducting plate. According to the studies of past great earthquakes, a weak seismic coupling is suggested in the offshore Sanriku region. From the distribution of past seismicity, the width of coupling at 40°N was assumed to be about 150 km. In 1999, an investigation was conducted in the source regions of the 1968 offshore Tokachi earthquake and the 1994 offshore Sanriku earthquake. It was found that the structures of crust are heterogeneous in the north and south of 40°10' N. The thickness of the crust is 21 km in the north and 15 km in the south. The P wave velocity in the north is 7% slower than that in the south.〔"Heterogeneous structure across the source regions of the 1968 and the 1994 Sanriku-Haruka-Oki earthquakes" by J. Kasahara, T. Hayakawa, R. Hino, T. Sato, M. Shinohara, A. Kamimura, M. Nishino, T. Sato, and T. Kanazawa〕 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「1994 offshore Sanriku earthquake」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.