Crustal structure and fluid distribution beneath the southern part of the Hidaka collision zone revealed by 3-D electrical resistivity modeling

Ichihara Hiroshi; Mogi Toru; Tanimoto Kengo; Yamaya Yusuke; Hashimoto Takeshi; Uyeshima Makoto; Ogawa Yasuo

タイトル	en Crustal structure and fluid distribution beneath the southern part of the Hidaka collision zone revealed by 3-D electrical resistivity modeling
作成者	en Ichihara, Hiroshi en Mogi, Toru en Tanimoto, Kengo en Yamaya, Yusuke en Hashimoto, Takeshi NRID 1000070283588 en Uyeshima, Makoto en Ogawa, Yasuo
アクセス権	open access
権利情報	en An edited version of this paper was published by AGU. Copyright 2016 American Geophysical Union
主題	NDC 450
内容注記	Abstract en The Hidaka collision zone, where the Kurile and northeastern (NE) Japan arcs collide, provides a useful study area for elucidating the processes of arc-continent evolution and inland earthquakes. To produce an image of the collision structure and elucidate the mechanisms of anomalously deep inland earthquakes such as the 1970 Hidaka earthquake (M6.7), we conducted magnetotelluric observations and generated a three-dimensional resistivity distribution in the southern part of the Hidaka collision zone. The modeled resistivity was characterized by a high resistivity area in the upper crust of the Kurile arc corresponding to metamorphic rocks. The model also showed conductive zones beneath the center of the collision zone. The boundary between the resistive and conductive areas corresponds geometrically to the Hidaka main thrust, which is regarded as the arc-arc boundary. The correspondence supports the collision model that the upper-middle part of crust in the Kurile arc is obducting over the NE Japan arc. The conductive areas were interpreted as fluid-filled zones associated with collision processes and upwelling of dehydrated fluid from the subducting Pacific slab. The fluid flow possibly contributes to over-pressurized conduction that produces deep inland earthquakes. We also observed a significant conductive anomaly beneath the area of Horoman peridotite, which may be related to the uplift of mantle materials to the surface.
出版者	en American Geophysical Union
日付	Issued2016-04-29
言語	eng
資源タイプ	journal article
出版タイプ	VoR
資源識別子	HDL http://hdl.handle.net/2115/64582
関連	isIdenticalTo DOI https://doi.org/10.1002/2015GC006222
収録誌情報	PISSN 1525-2027 en Geochemistry Geophysics Geosystems 巻17 号4 開始ページ1480 終了ページ1491
ファイル	fulltext Ichihara_et_al-2016-Geochemistry,_Geophysics,_Geosystems.pdf 3.08 MB (application/pdf) Issued2016-04-29
コンテンツ更新日時	2023-07-26