【摘要】 本文利用40个地震震源机制解和3个小震综合解研究了甘肃及邻近地区的地壳应力场。结果表明,由甘肃西部到东南部,主压应力方向由北40°东逐渐变为北90°东,P轴仰角大多小于30°,其水平方向垂直于青藏高原东北边缘。反映了该区的力源主要来自于印度板块与欧亚板块的碰撞。一些地区局部应力场的变化对研究断层活动有重要意义。更多还原

【Abstract】 Using 40 mechanism solutions of earthquake focus and 3 synthetic solutions of small earthquake, the crustal stress field in and around Gansu region is discussed. The directions of P-axes from the western area to the southeastern area changed from N40°E to N90°E step by step. The horizontal directions of P-axes are vertical to the northeast edge of Tibet Plateau, and the elevation angles of P-axes are less than 30°. It will be shown that the power source of this region is caused by the collision between India and Eurasia plate. The change of regional stress field is of great value for discussing the fault activity.更多还原