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2013年4月20日四川芦山7.0级地震震源破裂特征

DOI: 10.6038/cjg20131015, PP. 3396-3403

Keywords: 芦山地震,反投影,龙门山断裂带

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Abstract:

2013年4月20日四川芦山发生7.0级地震.本文运用反投影远震P波的方法研究了中心频率为1Hz的芦山地震震源破裂特征.研究结果显示2013年芦山7.0级地震破裂长度约为20km,震源破裂时间约为26s.本文认为在芦山地震的开始阶段(0~4s)震源的破裂是向震中位置两侧进行的.而芦山地震破裂的第二阶段(5~26s)是单侧破裂.芦山地震最大能量释放区域位于震中以北.本文对比了运用相同方法研究的发生在同一断裂带上的2008年汶川地震震源破裂特征.发现2013年芦山地震和2008年汶川地震有三点相似之处,即,破裂主要沿北东走向的龙门山断裂带发展;最大能量释放区域没有位于震中;能量都是通过多次子事件来释放的,且第二次能量释放是最大能量释放.对比两次地震破裂区域,可以看出芦山地震的破裂区域是在2008年汶川地震破裂区域的西南端发展的.两次地震的破裂区域占了整个龙门山断裂带的三分之二.

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