Using the data set of 20±2 sec and(A/T)max of surface waves recorded by Type-763 and Type-SK seismographs from five stations in Beijing and elsewhere,the mean square deviations u and relative mean dev
In this paper,we select 131 accelerograms observed in the Yunnan area and cite 114 accelerograms from western America.By statistical regression analysis,we get two separate acceleration attenuation fo