中国强地震动位移衰减关系的研究

THE ATTENUATION RESEARCH OF THE STRONG GROUND DISPLACEMENT IN CHINA

根据断裂力学破裂模式，发现峰值地震动加速度（PGA）、速度（PGV）和位移（PGD）均对构造环境剪应力场量值了τ0有强烈的依赖性．本文把了τ0值定量地引入到PGD的预测方程中，并同时考虑得到了PGD的优势频率fd对震级的依赖性.基于以上两点改进，从理论上寻出了PGD的预测方程（CLB98d）．用观测资料验证了此方程可用于震中距△＝10─250km范围内的Mw＝4─7．2地震．世界不同地区的τ0值会有差异，但对PGD的预测方程影响不大．

We have found from the fracture mechanics rupture model of earthquakes that the peak ground acceleration PGA and velocity PGV and displacement PGD strongly depend on the tectonic ambient shear stress value τ0．τ0 value is introduced into the predictive equation of PGD by us, at the same time the dependence of predominant frequency of PGD fd on magnitude is considered. Based on both improvements, the predictive equation of PGD (CLB98d) has been derived from theoretical analysis. It has been tested by observahon data that this predichve equahonit is sintable for epicentral distance range △=10-250km and magnitude range Mw = 4-7.2. There are different To values in different regions all over the world, but the influence of τ0 value on PGD is not large.