Loess liquefaction effect and the risk assessment method of its secondary disasters:a case study of Jishishan Ms6.2 earthquake
The Ms6.2 earthquake that struck Jishishan,Gansu,on December 18,2023,induced several geological disasters,including loess liquefaction mudflows.These events caused a large number of casualties and property losses.Taking this earthquake as the background,this study aims to systematically outline the methodology for liquefaction investigation,risk assessment,and risk zoning.The intrinsic and induced factors of liquefaction in the study area were identified.The initial step involved creating a base map for the investigation,utilizing collected information and conducting surveys through questionnaires to identify liquefaction-influencing factors.Geo-physical exploration and drilling work were then employed to ascertain the actual material map of soil liquefaction development potential.Conventional assessment methods for geological disasters were applied to carry out susceptibility,vulnerability,and risk assessments in the study area.These assessments led to the creation of a risk zoning map.The proposed method was used to verify the debris flow disaster induced by the Ms6.2 earthquake.The geological environment background,formation mechanism,and hazard characteristics of the debris flow disaster were analyzed,followed by an evaluation of the risk involved.This study presents a pioneering ap-proach to selecting regional investigation factors and performing risk assessments for soil lique-faction and its secondary disasters.These methodologies can serve as a reference for investigating soil liquefaction and its secondary disasters,as well as for land space planning.This is especially pertinent for geological safety assessments and site selection recommendations for concentrated settlements in high-intensity mountainous areas.
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