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

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Title: Crustal structure and fluid distribution beneath the southern part of the Hidaka collision zone revealed by 3-D electrical resistivity modeling
Authors: Ichihara, Hiroshi Browse this author
Mogi, Toru Browse this author
Tanimoto, Kengo Browse this author
Yamaya, Yusuke Browse this author
Hashimoto, Takeshi Browse this author →KAKEN DB
Uyeshima, Makoto Browse this author
Ogawa, Yasuo Browse this author
Issue Date: 29-Apr-2016
Publisher: American Geophysical Union
Journal Title: Geochemistry Geophysics Geosystems
Volume: 17
Issue: 4
Start Page: 1480
End Page: 1491
Publisher DOI: 10.1002/2015GC006222
Abstract: 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.
Rights: An edited version of this paper was published by AGU. Copyright 2016 American Geophysical Union
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 橋本 武志

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