论文部分内容阅读
本文利用宁夏地震台网观测资料,讨论了宁夏区内七个地区的区域应力场,并且给出了16次中强地震的震源机制解。结合大地形变测量资料分析认为,宁夏北部银川平原的区域应力场以北北东方向的主压应力占优势。宁夏南部西(吉)、海(原)、固(原)地区的区域应力场以北东方向的主压应力占优势。南部和北部两区域的分界带在中卫、中宁一线。中卫附近的主压应力方位为165°,与其南部、北部地区都不相同。本文研究结果认为,现今宁夏构造应力场的格局与印度板块和太平洋板块的共同作用有关,其中印度板块的推挤起主导作用。
Based on the observation data of Ningxia Seismic Network, this paper discusses the regional stress field of seven regions in Ningxia, and gives focal mechanism solutions of 16 moderate earthquakes. According to the data of geodetic deformation measurement, the principal compressive stress in north and east direction dominated the regional stress field in the Yinchuan Plain in northern Ningxia. The main stress of the north east direction of the regional stress field in western Ningxia, Haiyuan (former) and Guyuan (original) regions of Ningxia is dominant. The dividing line between the southern and northern regions is at Zhongwei and Zhongning. The main compression stress near Zhongwei is 165 °, which is different from the southern and northern regions. The results of this study suggest that the current pattern of tectonic stress field in Ningxia is related to the interaction of the Indian and Pacific plates, of which the Indian plate plays a dominant role.