图1 松潘7.2级地震震中附近主要断裂及历史强震震中分布图

Fig.1  Major faults surrounding the epicenter of the M7.2 Songpan earthquake and

       epicentral distribution of historical strong earthquakes

① 岷江断裂； ② 雪宝顶断裂； ③ 虎牙断裂； ④ 龙门山断裂