论文部分内容阅读
根据主震、余震、晚期余震震源机制解的P轴、T轴取向的变化,认为在地震序列发展过程中震源应力场曾发生复杂转换。文中还联系地质构造和地壳形变资料讨论了该区构造应力作用方式和发震构造。结果认为在区域性近南北向压力作用下,苍城—海陵大断裂及平冈断裂发生左旋滑动,断裂西北盘因各段滑动速度差异,诱导出洋边海引张应力机制,促发地震活动的模式能合理解释现场各种观测资料。
According to the changes of the P-axis and T-axis orientations of the main shock, aftershock and focal aftertalk solutions of the late aftershocks, it is considered that the source stress field has undergone complex conversion during the development of the earthquake sequence. The paper also discusses the tectonic stress mode and seismogenic structure in this area in connection with geological structure and crustal deformation data. The results show that the Cangcheng-Hailing fault and the Pangang fault have a left-lateral slip under the regional near-north-south pressure. Due to the difference of slip velocities in the sections of the northwestern fault, the tensile stress mechanism of the Yangbian Sea is induced and the seismic activity is induced The model can reasonably explain a variety of on-site observation data.