岫岩5.4级地震序列主应力变化特征研究

Abstract

Abstract: Based on the active characteristics of 1999 Xiuyan earthquake series, it is divided into four periods, namely, foreshock, aftershock concentration, aftershock tranquilization and aftershock attenuation. We used 161 focal mechanisms of M2.5 from June of 1999 to September of 2000 and stress inversion method by Gephart to study the overall characteristics and time series variation characteristics of tectonic stress field in every period of source area. It is found that the direction of the principal compressional stress is basically consistent with the direction of tectonic stress field in North China, and the spatial orientation of the maximum principal compressional stress experienced relative stabilization before the mainshock-disperse after the main shock-relative stabilization before the maximum aftershock-disperse after the maximum aftershock. This result has a certain reference value for forecasting of main shock and the maximum aftershock.

Key words: Xiuyan earthquake series, Focal mechanism, Stress inversion, Time characteristics of the earthquakes series

CLC Number:

P315.7

LAN Cong-xin, LIU Jie, MA Shi-zhen, WU Min-jie, MIAO Chun-lan. Study on stress variation characteristics of Xiuyan 5.4 earthquake series[J]. EARTHQUAKE, 2006, 26(2): 73-82.

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Study on stress variation characteristics of Xiuyan 5.4 earthquake series

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