广东地区求解环境剪应力场不同方法的常数值的确定

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

陈培善等推导了多个求解环境剪应力场τ0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ML 2.0～5.2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 MPa,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τ0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.

Based on some formulae for estimating ambient shear stress τ0 which are deduced by Chen Peishan et al, we have studied the constants of formulae by using 161 earthquakes（ML2. 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： C3 =- 5. 707 ,C4= 4. 678,C5 = -0. 259,C6= - 5.91,C7= - 12.01. where C3 ,C4 ,C5 ,C6 ,C7 represent the constants of some formula estimating ambient shear stress respectively by the seismic radiated energy E, the corner frequency fc, the peak acceleration ap, the peak velocity vp, and the peak displacement dp. Comparisons are made of the constants for different areas, and it is found that the constants C4～C7 are roughly identical respectively for different areas, but the constant C3 differ significantly.