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2013年4月20日四川芦山M7.0级地震与余震精确定位及发震构造初探

DOI: 10.6038/cjg20130813, PP. 2636-2644

Keywords: 芦山地震,双差定位,震源位置,发震构造

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Abstract:

使用汇集在四川台网中心的固定台站、震后架设的流动台站、周边水库台站等震中距150km以内的震相数据,选用分层速度模型,对芦山7.0级地震及震后9天内的余震利用双差定位法进行了重新定位.给出了芦山7.0级地震的发震时刻为2013-04-2008:02:46.8,震中位置30.278°N,102.989°E,震源深度16.67km,给出了3324次余震的双差定位结果,并对发震构造进行了分析.结果表明:芦山地震主破裂长度约40km,下倾宽度约20km,破裂视面积约800km2,主破裂沿南西走向,倾角约40°.余震震源优势深度为10~22km.余震沿南西走向,主要集中于大邑—名山断裂上盘.

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