由震源机制解分析华北地区构造应力场

Tectonic Stress Field of North China Based on Focal Mechanism Solutions

利用初动及振幅比方法对华北地区中小地震震源机制解及构造应力场进行分析。结果表明:研究区内中小地震震源断错性质主要以走滑断层为主,震中处破裂面与其附近构造走向基本保持一致,依据节面滑动角及P轴、T轴倾角数据推断,震源处应力主要以水平方向为主,主压应力P轴方向基本上为NEE-SWW向。

In this paper,the focal mechanism solutions of moderate and small earthquakes in north China and the tectonic stress field is analyzed.The focal mechanism solutions are calculated using the initial motion method and the amplitude ratio method.The results show that the focal rupture of the moderate and small earthquakes in north China is mainly composed of strike-slip faults.According to the nodal plane sliding angle and P axis and T axis angle,the main source of stress is in the horizontal direction.The direction of the main compression stress P axis is NEE-SWW.