Current stress state and principal stress rotations in the vicinity of the Chelungpu fault induced by the 1999 Chi-Chi, Taiwan, earthquake

Weiren Lin, En Chao Yeh, Hisao Ito, Jih Hao Hung, Tetsuro Hirono, Wonn Soh, Kuo Fong Ma, Masataka Kinoshita, Chien Ying Wang, Sheng Rong Song

研究成果: 雜誌貢獻期刊論文同行評審

43 引文 斯高帕斯(Scopus)

摘要

We carried out various stress measurements in boreholes penetrating the northern segment of the Chelungpu fault, drilled about 5 years after the 1999 Chi-Chi, Taiwan, earthquake. In the possible depth range of the Chelungpu fault, three major fault zones were encountered. Clearly recognizable principal stress rotations in the vicinity of the shallowest major fault zone, at 1133 m depth in hole B, suggest that this fault zone ruptured during the 1999 earthquake. Moreover, the fault's rupturing altered the stress state in the area surrounding this fault zone. In this paper, we constrain the possible magnitudes of the current principal horizontal stresses around the fault zone and show that the current stress state belongs to a normal or strike-slip fault regime. Therefore, the stress state was changed from that of a reverse fault regime by the rupturing.

原文???core.languages.en_GB???
文章編號L16307
期刊Geophysical Research Letters
34
發行號16
DOIs
出版狀態已出版 - 28 8月 2007

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