图1  松潘（黄龙）6．5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 and the epicenter distribution of historical

         earthquake in the M 6．5 Songpan (Huanglong) earthquake area

         ①岷江断裂；  ②雪宝顶断裂；  ③虎牙断裂；  ④龙门山断裂带