Abstract: This paper discusses the seismogeological background of the Songpan-Pingwu earthquakes, their seismicity, the characteristics of tectonic stress field and the conditions of seismogenic structures in the region under investigation.Judging from the location of epicenters of three strong shocks along the Huya fault, the contour of their synthetic isoseismals and the agreement of fault plane solutions with the occurrence of Huya fault, the authors come to a preliminary conclusion that the studied events were caused by the dip-slip displacement of NNW trending Huya fault with a slightly sinistral component and under the action of nearly EW trending tectonic stress field.

摘要： 本文着重讨论了松潘、平武地震的地震地质背景,地震活动性和构造应力场特征,以及发震构造条件。根据1976年连续发生的三次强震震中沿虎牙断裂分布,综合等烈度线的形态特征和震源机制解的结果与虎牙断裂产状基本一致的事实,认为松潘、平武地震是由于北北西向的虎牙断裂在近东西向的构造应力场作用下发生枢纽性的倾向滑动并伴随一定左旋扭动的结果。