断裂带同震温度负异常机制分析

Xiaoqiu Yang, Weiren Lin, En Chao Yeh, Hehua Xu, Ziying Xu

    研究成果: 雜誌貢獻期刊論文同行評審

    摘要

    The coseismic temperature responses can be recognized in the borehole temperature measurements in fault zones after earthquakes. It provides a unique idea and an effective mean for basic research about the friction features and seismogenic mechanisms of fault zones. Borehole temperature measurement results show that there were both positive and negative temperature anomalies that followed the 1999 Chi-Chi, 2008 Wenchuan and 2011 Tohoku earthquakes. The positive temperature anomaly (within 5~20 m away from fault slip surfaces) has been well known because of the frictional heating that occurred during coseismic faulting. However, the negative temperature anomaly (range of 20~60 m from fault slip surfaces) still has not been noted and expressly addressed. The amplitude of the negative temperature anomaly is 1/4~1/3 of that of the positive temperature anomaly; but the range of the negative temperature anomaly are 3~4 times of that of positive anomaly. In that case, the total of energy in the negative and positive areas is basically the same. Therefore, the negative anomalies in borehole temperature measurement and their causes can no longer be ignored. After a detailed analysis of several possible mechanisms of coseismic temperature negative anomalies (i.e., differences in distribution of thermal properties, fluid migration and increase of surface free energy), it is found that only coseismic stress release is a universal mechanism that can be supported in theory, experiment and field observation. This may be the main reason for the negative temperature anomaly in fault zones after earthquakes.

    貢獻的翻譯標題Analysis on the mechanisms of coseismic temperature negative anomaly in fault zones
    原文繁體中文
    頁(從 - 到)1422-1430
    頁數9
    期刊Acta Geophysica Sinica
    63
    發行號4
    DOIs
    出版狀態已發佈 - 2020 四月 1

    Keywords

    • Chi-Chi earthquake
    • Coseismic stress release
    • Frictional heating
    • Surface free energy
    • The mechanisms of coseismic temperature responses
    • Tohoku earthquake
    • Wenchuan earthquake

    ASJC Scopus subject areas

    • 地球物理
    • 地球化學與岩石學

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