青海玉树M_S7.1级地震地质灾害主要特征

2010年4月14日7时49分,青海省玉树县发生MS7.1级地震。玉树地震产生较连续的地表破裂和大量房屋破坏,并诱发了滑坡、崩塌和震裂山体。此外,地震诱发的砂土液化、水渠溃决等加剧了局部山体地质灾害。通过现场调查和地震前后玉树县地质灾害发育状况,简要阐述了地震地质灾害的主要发育特征,包括震后地质灾害数量明显增加、地震地质灾害分布受活动断裂控制、低位滑坡为主、地质灾害链生效应显著等,并对灾后重建过程中的地质灾害防治提出了建议。

RESEARCH ON MAJOR CHARACTERISTICS OF GEOHAZARDS INDUCED BY THE YUSHU Ms7.1 EARTHQUAKE

The Yushu Ms 7.1 earthquake was happened at 7: 49 on April 14, 2010 in Yushu county of Qinghai province. Besides continuous surface rupture and a large number of properties collapse,the types of geohazards induced by earthquake include rock fall,landslide,potential debris flow,etc. In addition,the geohazards can be aggravated by the earthquake induced sandy soil liquefaction,as well as burst of a channel,in local areas. Based on field investigation and comparison of the geohazard data before and after the Yushu earthquake,the authors summarize the major characteristics of the Yushu Ms7.1 earthquake,such as the amount of geohazard increasing obviously after the earthquake,the distribution of geohazards controlled by the active faults,the low position soil/colluvial landslides predominant,the effect of geohazard chain being notable,etc. some proposals for geohazard control during reconstruction have been given forth in this paper．