西北地质2024，Vol.57Issue(2)：209-219,11.DOI:10.12401/j.nwg.2024013
甘肃临夏积石山县6.2级地震地质灾害发育特征及危险性评价
Development Feature and Risk Assessment of Geological Hazards Caused by the Ms 6.2 Earthquake in Jishishan County,Linxia,Gansu Province
摘要
Abstract
On December 18,2023 at 23:59,an Ms6.2 earthquake occurred in Jishishan County,Linxia Prefec-ture,Gansu Province,triggering a large number of landslides and geological disasters,seriously threatening the safety of people's lives and property.This article is based on the results of on-site investigations in earthquake prone areas,conducting research on the development characteristics and risk assessment of geological disasters induced by earthquakes,and proposing suggestions for disaster prevention and reduction measures.According to on-site investigations and statistics,there are 64 new geological hazard points added after this earthquake.There are 63 potential geological hazards that have intensified.The main hidden danger points of newly added and in-tensified deformation are landslides,followed by landslides;The scale level is mainly small,followed by medi-um.Landslide geological disasters are mainly concentrated in loess hilly areas,with the main focus on building houses and roads by cutting slopes in steep loess slopes.The weighted information method based on GIS tech-nology was used to evaluate the susceptibility of geological disasters in Jishishan County.The evaluation results showed that the proportions of high susceptibility areas,medium susceptibility areas,low susceptibility areas,and non susceptibility areas were 5.45%,9.83%,32.70%,and 52.02%,respectively.The high susceptibility ar-eas were mainly distributed in the mountain ridge area of the loess hilly area in the eastern part of Jishi Moun-tain.On the basis of regional geological hazard susceptibility assessment,a geological hazard risk assessment of Jishishan County was conducted based on seismic activity faults,seismic motion distribution,and different rain-fall conditions(10 year,20 year,50 year,100 year return period).The evaluation results showed that the maxi-mum increase in the 100 year return period extremely dangerous area compared to the 10 year return period ex-tremely dangerous area was 18.26%,In the future,encountering extreme rainfall in the area will significantly in-crease the risk of geological disasters in the area.Research suggests that the post earthquake effects of geologi-cal disasters in Jishishan will be enhanced,and the frequency of landslides and collapses will increase in the fu-ture.Geological disasters are prone to form under precipitation and freeze-thaw conditions,and targeted preven-tion and control measures need to be taken to effectively reduce their threat level.关键词
地震/地质灾害/发育特征/危险性评价/甘肃积石山Key words
earthquake/geological hazards/developmental feature/risk assessment/Jishishan in Gansu分类
天文与地球科学引用本文复制引用
高波,董英,贾俊,薛强,武文英,李林,王涛,刘港,江睿君..甘肃临夏积石山县6.2级地震地质灾害发育特征及危险性评价[J].西北地质,2024,57(2):209-219,11.基金项目
国家自然科学基金项目"黄土丘陵植被与淤地坝调控重力侵蚀的协同作用机制"(42177346),中国地质调查局项目"西北黄土高原区地质灾害智能监测预警系统应用示范"(DD20230443),"黄土高原等典型地区地质灾害精细调查与风险管控"(DD20221739)联合资助. （42177346）
