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ID 25980
本文ファイル
著者
Tanikawa, Wataru
Mishima, Toshiaki
Hirono, Tetsuro
Lin, Weiren
Shimamoto, Toshihiko
Soh, Wonn
Song, Sheng-Rong
キーワード
magnetic susceptibility
the Chi-Chi earthquake
frictional heating
NDC
地球科学・地学・地質学
抄録(英)
We carried out high-velocity frictional tests on crushed fault gouge from core samples from Hole B of the Taiwan Chelungpu-fault Drilling Project to investigate the cause of high magnetic susceptibilities in the fault core. Black ultracataclasite resembling that observed in Hole B formed during the experiments, even under low axial stress of 0.5 to 1.5 MPa. The bulk magnetic susceptibility of the tested samples was proportional to the frictional work applied and increased as slip increased. Thermomagnetic analysis of the samples before frictional testing revealed that magnetization increased at temperatures above 400 °C, probably because of thermal decomposition of paramagnetic minerals. Both the thermally and mechanically induced formation of ferrimagnetic minerals by high velocity friction might have caused a magnetic susceptibility anomaly. Our experimental results support the assumption that heat generation of short duration, even if it is below the melting point, can increase magnetic susceptibility.
掲載誌名
Geophysical Research Letters
34巻
開始ページ
L15304
出版年月日
2007
出版者
American Geophysical Union
ISSN
0094-8276
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
author
権利情報
Copyright (c) 2007 American Geophysical Union
関連情報URL
部局名
理学研究科