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中文摘要：
摘要2013年4月20El发生了四川芦山慨7．0地震，主震中位于青藏地块与华南地块结合部的龙门山断裂带南端．本研究用双差定位法对芦山地震主震及余震序列进行重新定位，得到主震位置为（30.29°N，102．97°E，17．82km）及4100多次余震重新定位结果．利用GSN／IRIs台网和国家台网及四川省区域台网的波形数据对主震及部分余震进行了震源机制解反演．结果表明，主震为一次逆冲地震，根据余震序列分布确定发震断层面走向为200°，震源机制解断层倾角为45°．基于震源断层面解和断层滑动方向，采用力轴张量计算法得到了研究区域的平均主压应力方向约为N112°E．
英文摘要：
On the 20th of April 2013, Lushan Ms7. 0 earthquake occurred in southwest Longmenshan fault which is the boundary of Qingzang block and South China block. In this study, firstly, using double difference algorithm, the locations of main shock （30.29°N, 102.97°E, 17.82 km） and about more than 4100 aftershocks are obtained. Secondly, using seismic waveforms from GSN/IRIS and Sichuan province digital seismic network the focal mechanisms of the main shock and some aftershocks of Ms〉3.0 are determined. According to the focal mechanism and relocation results, the main shock is a thrust type earthquake, and the strike of the fault plane is 200°. Finally, based on the orientation and slip direction of the fault plane solutions and using mechanism axis tensor method, the direction of the mean stress field is obtained.
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