Magnetotelluric imaging of the Median Tectonic Line in western Shikoku, southwest Japan: Implications of the fault-related low-resistivity zone

被引：13

作者：

Ikeda, Michiharu ^{[1
]}

Kato, Sayomasa ^{[1
]}

Nishizaka, Naoki ^{[2
]}

Ohno, Yuki ^{[2
]}

Matsuo, Koichi ^{[3
]}

Kishimoto, Munemaru ^{[4
]}

机构：

[1] Shikoku Res Inst Inc, Dept Civil Engn, Takamatsu, Kagawa 7610192, Japan

[2] Shikoku Elect Power Co Inc, Dept Civil & Architectural Engn, Takamatsu, Kagawa 7608573, Japan

[3] Nittetsu Min Co Ltd, Dept Resource Dev, Chiyoda Ku, Muroran, Hokkaido 1008377, Japan

[4] Nittetsu Min Consultants Co Ltd, Dept Geophys Survey, Minato Ku, Muroran, Hokkaido 1080014, Japan

来源：

TECTONOPHYSICS | 2013年 / 601卷

关键词：

Magnetotelluric survey; Low-resistivity zone; Property of fault damage zone; Median Tectonic Line (MTL); SAN-ANDREAS FAULT; ELECTRICAL STRUCTURE; CRUSTAL STRUCTURE; CREEPING SEGMENT; DEFORMATION; EARTHQUAKE; SUBDUCTION; TURKEY; FLUIDS; CONDUCTORS;

D O I：

10.1016/j.tecto.2013.04.026

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

We carried out a magnetotelluric (MT) survey along a profile crossing the Median Tectonic Line (MTL in western Shikoku, Japan. The MTL is a terrane boundary that formed during the Cretaceous between the Sanbagawa belt, consisting of high pressure/temperature (P/T) metamorphic rocks, and the Ryoke belt of granites and low P/T metamorphic rocks. The MT image shows a zone of remarkably low resistivity, dipping northward at 40, at the surface coincides with the surface trace of the MTL. The low-resistivity zone probably corresponds to a fluid-filled damaged zone of porous media composed of clay minerals and cracked rocks, formed by repeated faulting of the MTL since Late Cretaceous time. The calculated maximum porosity of the damaged zone is 7.1%, which is clearly higher than that of the non-damaged crystalline rocks. (C) 2013 Elsevier B.V. All rights reserved.

引用

页码：78 / 86

页数：9

共 29 条

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