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Lushan M_S7.0 earthquake:A blind reserve-fault event

XU XiWei  WEN XueZe  HAN ZhuJun  CHEN GuiHua  LI ChuanYou  ZHENG WenJun  ZHNAG ShiMin  REN ZhiQun  XU Chong  TAN XiBin  WEI ZhanYu  WANG MingMing  REN JunJie  HE ZhongTai  LIANG MingJian  
【摘要】:In the epicenter of the Lushan MS7.0 earthquake there are several imbricate active reverse faults lying from northwest to southeast,namely the Gengda-Longdong,Yanjing-Wulong,Shuangshi-Dachuan and Dayi faults.Emergency field investigations have indicated that no apparent earthquake surface rupture zones were located along these active faults or their adjacent areas.Only brittle compressive ruptures in the cement-covered pavements can be seen in Shuangshi,Taiping,Longxing and Longmen Townships,and these ruptures show that a local crustal shortening occurred in the region during the earthquake.Combining spatial distribution of the relocated aftershocks and focal mechanism solutions,it is inferred that the Lushan earthquake is classified as a typical blind reverse-fault earthquake,and it is advised that the relevant departments should pay great attention to other historically un-ruptured segments along the Longmenshan thrust belt and throughout its adjacent areas.

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