西海固地区构造应力场特征及其与地震活动性的关系

THE CHARACTERISTICS OF TECTONIC STRESS FIELD AND ITS RELATIONS TO SEISMICITY IN XIJI-HAIYUAN-GUYUAN REGION

摘要:

我们根据该区11个M_s ≥ 3.5级地震的震源机制资料,求得该区主压应力轴的平均方向为北东75°,平均仰角为17°。结合地形变资料和深部构造特征,讨论了该区构造应力场特征及其与地震活动性的关系。

Abstract:

Based on the data of fourteen earthquakes mechanism solutions(M_s ≥ 3.5), the average orientation of principal compression stress axis (NE74°) and its dip (18°) in Xiji-Haiyuan-Guyuan region have been obtained. In connection with the data of crustal deformation measurements and the deep structure, the relations between tectonic stress field and seismicity have been discussed.