广东地区求解环境剪应力场不同方法的常数值的确定

陈培善等推导了多个求解环境剪应力场0τ的公式,利用广东数字地震台网记录到的广东及邻近地区1999年以来163个ML2.0~5.2地震求解不同公式中的常数,假设广东地区环境剪应力场为5 M Pa,求得C3=-5.707,C4=4.678,C5=-0.259、C6=-5.91、C7=-12.01,C3~C7依次代表利用地震波辐射能量、拐角频率、震源峰值加速度、震源峰值速度或震源峰值位移求解0τ时所用到的常数。与其它地区的计算结果比较,显示不同地区的C4~C7较为接近,而C3相差较大。

Determination of the Constants of Some Formulae for Estimating Ambient Shear Stress Field in Guangdong Area

Based on some formulae for estimating ambient shear stress τ_0 which are deduced by Chen Pei-shan et al,we have studied the constants of formulae by using 161 earthquakes(M_L2.5-5.2) occurring in Guangdong and its adjacent area recorded by Guangdong Digital Telemetry Seismogragh Network.Supposing that the level of ambient shear stress field of Guangdong area is 5 MPa,we get: C_3=-5.707,C_4=4.678,C_5=-0.259?C_6=-5.91?C_7=-12.01.where C_3,C_4,C_5,C_6,C_7 represent the constants of some formula estimating ambient shear stress respectively by the seismic radiated energy E,the corner frequency f_c,the peak acceleration a_p,the peak velocity v_p,and the peak displacement d_p.Comparisons are made of the constants for different areas,and it is found that the constants C_4～C_7 are roughly identical respectively for different areas,but the constant C_3 differ significantly.