Evaluation of Influence of Diffuse Earthquakes Based on Near-Source Ground Motion Acceleration Recordings

On the basis of near-source saturation characteristics of ground motion,the peak ground motion acceleration and the acceleration response spectra of diffuse earthquakes can be determined by the statistic method.The ground motion samples are chosen by the saturation ranges which are determined comprehensively by near-source attenuation characteristics,size of sources and range of meizoseismal area.In order to obtain sufficient recording samples,a transformation method is proposed to transform the response spectra on the soil site to that on the equivalent rock site.Finally we obtain the design response spectra and discrete characteristics for diffuse earthquakes of which magnitude is 5.0,5.5 and 6.0 respectively.