In April 20, 2013, a strong earthquake measured Ms 7.0 hitted Lushan county, Sichuan province, which was induced by Longmenshan front fault, i.e. Dachuan-Shuangshi fault. It was the second large earthquake occurred along Longmenshan fault zone since Wenchuan earthquake in 2008. From April 25 on, the authors made three field visits to the quake-hit area. The disasters were summarized, and the potential problems during post-quake reconstruction were discussed. The results showed that compared with Wenchuan earthquake, the quake-induced disasters were lighter; no obvious surface ruptures were ever witnessed along the quake-inducing fault; both landslide and rockfall happened in small scale, so no large barrier lake was ever formed; landslide distributed along the seismogenic fault, and the rock types were Xujiahe Formation of Upper Triassic; rockfall appeared mainly in the gorge segment of rivers, and the rock types were mainly conglomerate and secondly intrusive rock; severe building damages were mainly brick-wood structured residential housings or brick-concrete-structured ones without constructional columns or ring beams; the major geohazard problems during post-quake reconstruction were rockfalls along major roads and debris flow in Baxing county town.
[1] 中国地震台网中心.四川省雅安市芦山县7.0级地震[DB/OL].(2013-04-21)[2013-05-15]. http://news.ceic.ac.cn/CC20130420080246.html.
[2] 中国地震局.四川省芦山“4·20”7.0级强烈地震已造成196人死亡[EB/OL].(2013-04-30)[2013-05-15]. http://www.eqsc.gov.cn/zt/ljysdzzt_2191/swqk/201304/t20130430_26130.html
[3] 中国地震局.四川省芦山“4·20”7.0级强烈地震共记录到余震8791次[EB/OL].(2013-05-12)[2013-05-15]. http://www.cea.gov.cn/publish/dizhenj/464/515/20130514143912363341965/index.html.
[4] 唐荣昌,韩渭宾.四川活动断裂与地震[M].北京:地震出版社,1993.
[5] 邓起东,陈社发,赵小麟.龙门山及其邻区的构造和地震活动及动力学[J].地震地质,1994,16(4):389-403.
[6] 陈国光,计凤桔,周荣军,等.龙门山断裂带晚第四纪活动性分段的初步研究[J].地震地质,2007,29(3):657-673.
[7] 易桂喜,龙锋,乔慧珍,等.青藏高原东缘龙门山断裂带南西段地震危险性分析[J].国际地震动态,2012(6):97.
[8] 秦向辉,陈群策,谭成轩,等.龙门山断裂带西南段现今地应力状态与地震危险性分析[J].岩石力学与工程学报,2013,32(增1):2870-2876.
[9] 谢和平,邓建辉,台佳佳,等.汶川大地震灾害与灾区重建的岩土工程问题[J].岩石力学与工程学报,2008,27(9):1781-1791.
[10] TAI J J,DENG J H,CHEN F,et al.Characterization of Surface Rupture and Structural Damage in Hongkou Town During Wenchuan Earthquake[J].Journal of Earthquake and Tsunami,2011,5(4):363-387.
[11] 张岳桥,李海龙.龙门山断裂带西南段晚第四纪活动性调查与分析[J].第四纪研究,2010,30(4):699-710.