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Title:: Comparation of Geological Hazard Risks before and after Jiuzhaigou M_S7.0 Earthquake in 2017

Author(s):: FAN Qiang; JU Nengpan; XIE Mingli; ZHAO Jianjun; (State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,Sichuan,China)

Keywords:: collapse; geological hazard assessment; frequency ratio; risk zoning; Jiuzhaigou M_S7.0 earthquake

摘要:: 以九寨沟M_S7.0地震为例,分析同震形变及地震前后地质灾害(崩塌、滑坡、不稳定斜坡)分布规律,提取地震前后崩滑地质灾害影响因子,统计各个因子各个等级的频率比,根据频率比进行危险性与地质灾害易损性评价,最终完成九寨沟地震前后地质灾害风险区划。研究结果表明:九寨沟地震前地质灾害主要集中于沟道中,震后地质灾害主要集中于同震形变区域; 震后九寨沟县地质灾害风险范围提高至震前水平的120%,增加的风险区主要为漳扎镇和九寨沟景区。

Abstract:: Taking Jiuzhaigou earthquake as an example,we study the distribution law of co-seismic deformation and post-earthquake collapse geological disasters(collapse,landslide,unstable slope),and extract the influence factors of post-earthquake collapse geological disasters,and count the frequency ratio of each grade of each factor.Finally,according to the frequency ratio,we take the risk and geological disaster vulnerability assessment to complete the risk zoning before and after the Jiuzhaigou earthquake. The results show that the pre-earthquake geological disasters were mainly concentrated in the channel,and the post-earthquake geological disasters were mainly concentrated in the coseismic deformation zone.After Jiuzhaigou earthquake,the geological disaster risk range in Jiuzhaigou County increased to 120% before the earthquake level,and the increased risk zone was mainly Yuzha Town and Jiuzhaigou Scenic Area.