渭河断陷盆地及邻区环境剪应力场及其与震源参数关系研究

The distribution of ambient shear stress field and its relevancy to focal parameters in Weihe fault depression and its adjacent areas

利用陕西数字地震台网的数字地震资料研究了渭河断陷盆地及邻区的震源参数和环境剪应力场,结果表明该地区地壳内环境剪应力处于较低水平,平均值为12.7×105Pa,并据此分析了该地区的地震活动性,建立并探讨了环境剪应力与震级ML、地震矩M0、矩震级MW的关系,讨论了环境剪应力与震源深度间的关系。

In this paper, by using the broad digital data recorded by Shaanxi digital seismic network, the focal parameters and the ambient shear stress field in Weihe fault depression and its adjacent areas are determined. The results show that the ambient shear stress is low in this region, and the average value is 12.7× 10^5 Pa. The seismicity in this region is then discussed. The relations between ambient shear stress and magnitude ML, seismic moment M0 and moment magnitude MW are established and analyzed. And the relation between the ambient shear stress and the focal depth is discussed.