利用北京数字化台网资料估计首都圈地区的构造环境剪应力场

THE TECTONIC ENVIRONMENT SHEAR STRESS FIELD IN THE CAPITAL AREA BY USE OF THE DATA OF BEIJING DIGITAL SEISMIC TELEMETRY NETWORK

１９９３年陈培善等导出的峰值加速度、峰值速度和峰值位移与构造环境剪应力场τ０的关系式（文中式（１）～（３））由于没有震级的限制，可用来估计较小地震（ｍｂ＜３８）的τ０值。利用北京数字化台网记录到的２２次３级左右地震的资料，初步估计了首都圈地区的构造应力场。结果表明，首都圈地区的总体应力水平较低，近期发生大地震的可能性很小。

The relations (P S Chen et al,1993) between the peak acceleration ,velocity, displacement and the tectonic enviroment shear stress field τ 0,can be used to estimate τ 0 values for small earthquakes because of no magnitude limited for this relations.A preliminary estimates of the tectonic environment shear stress field in capital area has been made in terms of 22 earthquakes data of magnitude about 3.The results show that the general shear level in capital area is low,the possibility to occur large earthquake is very small.The areas with the relative higher stress level are Tangshan area, Qingshuiding-Longquansi, in Northeast Huaian, Shanxi province.