新疆天山地区与川滇地区中强地震震源机制解对比分析

利用1970年以来新疆天山地区和川滇地区中强地震震源机制解,对两区中强地震的错动性质做了对比分析,得出以下两点结论:(1)新疆天山地区中强地震断错性质复杂多样,主要以逆断层型和走滑型地震为主;而川滇地区强震主要以走滑型地震为主。(2)新疆天山地区走滑型地震大多包含倾滑分量,单纯的水平错动地震数量极少;而川滇地区走滑型地震的错动方式主要以水平错动为主,倾滑分量较小。

Comparative Analysis of the Focal Mechanism Solutions of the Mid-Strong Earthquakes between Tianshan, Xinjiang Area and Sichuan-Yunnan Area

Using the focal mechanism solutions of the mid-strong earthquakes in the Tianshan,Xinjiang area and Sichuan-Yunnan area since 1970,we comparatively analyzed the faulting features of the mid-strong earthquakes in the two areas.The results show:(1)The rupturing features of the mid-strong earthquakes are complex and diverse in the Tianshan,Xinjiang area,which are mainly characterized by thrust and strike-slip faulting;while the strong earthquakes in the Sichuan-Yunnan area are mainly characterized by strike-slip faulting.(2)Most of the strike-slip earthquakes in the Tianshan area contain dip-slip component,and pure horizontally-faulting earthquakes are very few;however,in the Sichuan-Yunnan area,the horizontal faulting is the main rupture way of the strike-slip type earthquake,and dip-slip component is very small.