云南地区部分地震的环境应力场特征

Environmental Stress Field Characteistics of Some Earthquakes in Yunnan Area

利用所获取的云南地区强震加速度观测资料 ,选取了其中具有震源深度参数及三个方向记录都完整的84次地震 ,震级范围为 3 0～ 7 6级 ,震中距为几公里至几十公里 (个别为 10 0多公里 ) ,根据陈培善用位错理论二维断裂力学模式推导的震源峰值加速度与环境应力场关系式 ,计算了云南地区部分地震的环境剪应力值 。

Based on the acceleration data recorded by strong motion seismometers, 84 earthquakes, which have the depth parameters and the complete recordings in three components, have been picked out. The magnitudes of these earthquakes range from M3.0 to M7.6. And the epicenters of theses earthquakes range from several kilometers to several ten kilometers. A few epicenters reach to more than 100 kilometers. According to the relation which is proposed by Chen Peishan,the values of environmental shear stress have been calculated. And the characteristics of environmental stress field have been discussed.