RESEARCH ON RELATIONSHIP BETWEEN LANDSLIDES AND PEAK GROUND ACCELERATIONS INDUCED BY WENCHUAN EARTHQUAKE
WANG Xiuying1，NIE Gaozhong2，WANG Dengwei3
(1. Institute of Crustal Dynamics，China Earthquake Administration，Beijing 100085，China；2. Institute of Geology，China Earthquake Administration，Beijing 100029，China；3. Xichang Seismic Station，Earthquake Administration of Sichuan Province， Xichang，Sichuan 615022，China)
Abstract：Based on the data of strong motion records of the corresponding peak ground acceleration(PGA) and data collected from almost 3 000 landslides induced by Wenchuan earthquake，the studies of earthquake-induced landslide and PGA are carried out and some conclusions are obtained as following：(1) There is a positive correlation between PGA and earthquake-induced landslides，and the higher the PGA is，the more serious the earthquake-induced landslides hazards are. (2) A 0.2 g PGA boundary is shown in the regional scale analysis in Longmenshan area；and earthquake-induced landslides hazards are more serious in the locations where PGAs are greater than this value. (3) The lower limit of PGA which can trigger landslides is 0.05–0.07 g，and there is rarely opportunity to induce landslides when PGA is less than this threshold. (4) Different critical accelerations are presented in different strata with the variation ranging from 0.05 g to 0.15 g；and the average PGA is about 0.1 g，which shows the slopes' proneness to earthquake excitation in the disaster areas. When PGA exceeds the critical acceleration of the local site，the probability to trigger landslide will increase. Results achieved from this study are in accord with results of other researchers，which gives a good consistency when earthquake-induced landslide is measured by ground motion parameters. The relationship between PGA and earthquake-induced landslide can be used to evaluate earthquake-induced landslides hazards quickly. Moreover，it can be applied to the work of earthquake- induced landslide forecasting or zonation，in which the achievement of PGA zonation can be adopted with the practical application.
WANG Xiuying1，NIE Gaozhong2，WANG Dengwei3. RESEARCH ON RELATIONSHIP BETWEEN LANDSLIDES AND PEAK GROUND ACCELERATIONS INDUCED BY WENCHUAN EARTHQUAKE. , 2010, 29(01): 82-89.
