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タイトル: Duplex Stress Regime in the North Fossa Magna, Central Japan
著者: Takeuchi, Akira
キーワード: tectonic stress field
active fault
Fossa Magna
fault history
central Japan
発行日: 2008年
出版者: 地震研究所
掲載誌情報: 地震研究所彙報. 第83号第2冊, 2008, pp. 155-162
抄録: The seismogenic zone along the Japan Sea coast of the Japanese archipelago is a site of active convergences between Amur and Okhotsk plates, as demonstrated by frequent occurrences of historical earthquakes larger than magnitude M6.5. The geologic structure of the zone is commonly characterized by the Neogene thrust/fold belt on the intra-arc continental shelves of both Northeast and Southwest Honshu arcs. A widespread stress field with a northwesterly orientation of maxi-mum principal stress axis is identified throughout the inner side of Honshu by seismotectonics and geodetic monitoring. As for the fault plane solutions of crustal earthquakes, thrust faulting dominates throughout the inner side of the Northeast Honshu arc, while paired fault provinces of thrust and strike-slip faulting are recognized along the inner Southwest Honshu arc. On the basis of a synchronism of seismicity between the Southwest Honshu arc and the Nankai Trough, strain partitioning might account for the strike-slip fault provinces due to oblique subduction of the Philippine Sea plate, as well as the collision of the Izu-Bonin arc with Southwest Honshu. As the easternmost portion of the Southwest Honshu arc is the overriding plate of the Philippine Sea Plate, a duplex stress regime of the northwest-southeast compression intercalated by north-south compression has been associated with the north Fossa Magna region.
URI: http://hdl.handle.net/2261/22014
ISSN: 00408992
出現カテゴリ:東京大学地震研究所彙報
東京大学地震研究所彙報

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