山西带中北部地区中小地震震源机制解特征
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摘要
利用山西地震台网记录的数字地震波形,采用基于P波初动极性和S/P振幅比(HASH)方法,反演了2008年10月-2013年4月期间发生在山西带中北部ML2.0级以上地震的震源机制解。结果表明,山西带中北部地区中小地震震源机制解种类较多,分布散乱。震源机制解除走滑型外,还有一定数量的正断层和逆断层类型,表明小地震的发生具有一定的随机性,华北构造应力场对研究区域的小震控制作用较弱,局部活动断裂对地震具有一定的控制作用。
Based on digital seismic waveform data from Shanxi seismic network,using the P wave first motion polarity and S/P amplitude ratio(HASH)method,we calculated the focal mechanism of ML2.0earthquakes occurred from 2008 October to 2013 April in the north-central Shanxi seismic belt.The results show that the focal mechanisms of small and medium earthquakes in north-central Shanxi seismic belt are disorder in type and distribution.Besides strike-slip type,there is certain number of normal and thrust types.It indicates that the occurrence of small earthquakes is random and the control of tectonic stress field of North China to the small earthquake in the study area is weak,while local active faults have certain control to small earthquakes.
引文
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