地质通报2018，Vol.37Issue(5)：747-758,12.
隐伏断层在强震砂土液化中的作用——以2008年汶川Mw7.9地震为例
The role of blind fault in soil liquefaction during strong earthquake: A case study of the 2008 Wenchuan Mw7.9 earthquake
摘要
Abstract
Strong ground shaking during the 2008 Wenchuan Mw7.9 earthquake caused widespread seismic hazard phenomena,such as sand liquefaction and water ejection,in the foothills of the Longmen Mountain in southwestern China.The results of field investigation after the earthquake showed that the majority of liquefaction sites occurred along major alluvial fan-building rivers,where the water table was a few meters below the surface and the earthquake was characterized by widespread gravely sand liquefaction,with ～58％ of liquefaction sites located 20～35km from the Beichuan fault.The authors recorded the water ejection height and the process of water ejection for the first time,and there was no clear correlation between water ejection height and peak ground acceleration,and clusters of sites with anomalously high (＞2m) water ejections were located near the surface projection of the piedmont fault system.The fact that the positions of anomalously high water ejections and gravely sand liquefaction during the Wenchuan earthquake were in line with the piedmont fault system indicates that the geological structure in a sedimentary basin is likely to play a role in augmenting liquefaction intensity and shaking-related seismic hazards,and hence in similar geological and hydrological environments,researchers should consider the geological structure playing an important role in seismic hazard evaluation and earthquake resistance design of buildings in addition to the primary earthquake-producing fault.关键词
汶川地震/砂土液化/山前断裂系统/砾性土液化/地震危险性Key words
Wenchuan earthquake/soil liquefaction/piedmont fault system/gravely sand liquefaction/seismic hazard分类
天文与地球科学引用本文复制引用
王鹏,刘静,张智慧,李志刚,张金玉,王伟,邢秀臣..隐伏断层在强震砂土液化中的作用——以2008年汶川Mw7.9地震为例[J].地质通报,2018,37(5):747-758,12.基金项目
国家自然科学基金项目《大陆型高原边界地形演化的对比研究》(批准号:41761144065)和川滇国家地震监测预报实验场项目《构造演化模型、地块模型和断裂廊带LIDAR实验》(编号:2017CESE0102) （批准号:41761144065）
