2013年内蒙古通辽5.3级地震震源断层三维特征反演

3-D Characteristics Inversion of Hypocenter Fault-plane of the 2013 Tongliao M5.3 Earthquake

采用Hyposat定位方法对2013年4月22日17时11分发生的内蒙古通辽(122.4°E,42.9°N)5.3级地震及其周边区域以往地震进行初步定位,再使用双差定位方法对该区域进行二次精确定位,从而得到该地区1976年以来小震较为精确的震源深度以及震中位置。利用得到的定位结果反演了主震的震源断层面参数;同时利用cap方法计算通辽5.3级地震的震源机制解,结合震源断层参数推断该地区地壳应力场及地质构造。结果显示,2013年通辽科左后旗地震,与养畜牧隐伏断裂活动有关。

On April 22,2013 17：11,an M5.3 earthquake occurred in Inner Mongolia Tongliao city（122.4°E,42.9°N）.The earthquake and earthquakes before and after the earthquake in the source region are firstly located using the Hyposat and then relocated using the double difference fine positioning inversion method.On basis of the relocated accurate epicenters,the parameters of the source fault of the M5.3 earthquake are inversed;at the same time,the focal mechanism solution of the earthquake is calculated using the CAP method which is used to infer the crustal stress field and geological structure in the region combining with the source fault parameters.The results show that the earthquake is related to the activity of the Yangxumu buried fault.