ANALYSIS OF LANDSLIDE INDUCED BY WENCHUAN EARTHQUAKE BY STRONG MOTION RECORDS
利用强震记录分析汶川地震诱发滑坡

Based on the Newmark analysis,a method is introduced to deduce critical acceleration with the data of strong motion records and landslides. With this method,critical accelerations are calculated with the data of earthquake-induced landslide and strong motion records obtained from 3 stations in Lixian County during Wenchuan earthquake. The estimated critical accelerations of Shaba,Taoping and Muka stations are 40,50 and 70 gal respectively. The results are in accord with the vulnerable geologic situations in the earthquake-hit area. The critical acceleration can be regarded as a quantitative criterion for judging the failure strain of a slope under earthquake excitations by ground motion parameters. It provides a new way to study earthquake-induced landslides with quantitative method. With the recommended method and the large number of strong motion records obtained from Wenchuan earthquake,critical accelerations in the Longmenshan region can be estimated;and it can provide quantitative reference information for the reconstruction work such as the engineering application,earthquake-induced landslides forecasting and localization in the earthquake-hit region. The research method and its results are helpful to promote the quantitative research on earthquake-induced landslides in China.