【摘要】 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2013-04-20 08∶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.更多还原

【Abstract】 The M7.0 Lushan earthquake and its aftershocks in 9 days were relocated by the double difference algorithm and layered velocity model,using the seismic phases within 150km recorded at stations including the fixed stations of the Sichuan earthquake network center,temporary stations and reservoir stations.The events analyzed include the main shock and its 3324 aftershocks.The results show that the original time of the main shock is 8 ∶ 02 ∶ 46.8 on 20 April 2013,hypocenter location 30.278°N,102.989°E and the focal depth 16.67 km.The main rupture is about 40 km long,20 km wide and of apparent area 800 km2.It strikes in southwest and dips about 40°.Most aftershocks occurred at depths 10~22 km,concentrating on the hanging wall of the Dayi-Minshan faults,forming a southwest-trending belt on the surface.Based on these and other data,this paper makes a preliminary analysis of the seismogenic structure of the Lushan event.更多还原