摘要
2023年12月18日甘肃省临夏州积石山县发生Ms6.2级地震,引发了大量地质灾害,威胁人民生命与基础设施的安全。地震后,甘肃、青海两省迅速开展地质灾害隐患核查,文章基于这次地震地质灾害调查成果,对积石山地震诱发地质灾害的特征、控制因素、发展趋势进行了分析,提出防灾减灾措施建议。截至12月23日,共核查隐患点2044处,包括78处新增地质灾害隐患、88处地震加剧变形的在库隐患点和1878处无明显变形的在库隐患点。新增和变形加剧的隐患点数量以崩塌居多,占67.5%,滑坡次之,占31.9%;规模等级以小型居多,占84.9%,中型次之,占10.8%;成灾模式多为小型崩塌威胁房屋和道路。同震地质灾害密集分布于发震断层附近,发育密度随地震烈度增强而增大。国家地质安全监测台网震中50 km范围内206组加速度计数据显示,震区峰值加速度为30.4~1969.7 mg,并随与震中距离的增大呈对数衰减。此外,地表变形监测设备也记录了典型滑坡的同震位移曲线。分析认为,积石山地震地质灾害后效应与链式致灾效应将增强,建议尽快更新震区地质灾害隐患点数据库,有针对性地实施风险防控措施,深入开展综合遥感监测与同震地质灾害机理研究,完善气象预警模型及阈值,有效降低地质灾害风险。
On December 18,2023,an Ms 6.2earthquake occurred in Jishishan County,Linxia Prefecture,Gansu Province,causing a large number of geological disasters and threatening people's lives and the safety of infrastructure.After the earthquake,Gansu and Qinghai provincial governments quickly deployed hundreds of geology professionals to carried out the investigation and verification geological disasters in the earthquake area.Based on the results of the earthquake geohazard investigation and verification,this paper analyses the characteristics,control factors and development trend of the earthquakeinduced geohazards,and puts forward suggestions on disaster prevention and risk mitigation measures.Till December 23,a total of 2044 geohazards have been checked,including 78 new geohazards,88 existing geohazards with intensified deformation due to earthquake,and 1878 existing geohazards without obvious different from before.Most of new and intensified deforming geohazards are collapse,accounting for 67.5%,followed by landslide,accounting for 31.9%.Most of new and intensified deforming geohazards are small in scale,accounting for 84.9%,followed by medium,accounting for 10.8%.Disaster mode of new and intensified deforming geohazards are mostly small collapse threatening houses and roads.The co-seismic geohazards are densely distributed along the seismic fault,and the spatial density increases with the enhancement of earthquake intensity.Data from 206 groups of accelerate-meters within 50 km from the epicenter of the National Geological Safety Monitoring Network showed that the peak acceleration of the earthquake area was 30.4~1969.7 mg.and decayed logarithm with the increase of the distance from the epicenter.In addition,the surface deformation monitoring equipment also recorded the coseismic displacement curve of a typical landslide.Analysis shows,earthquake put a deteriorate effect to rock and soil,which decreased their integration and strength.There is a magnificent geohazard after-effect of earthquake;collapse,landslide and debris flow will be much often than before.So the authors suggest:(1)update earthquake geohazard database as soon as possible,(2)work out targeted prevention and control measures for the geohazards with large potential danger,(3)conduct comprehensive remote sensing monitoring and research of earthquake-induced geohazard mechanism,(4)improve the meteorological early warning model and threshold.By all this efforts the risk of geohazards after earthquake will be reduced and controlled.
作者
王立朝
侯圣山
董英
铁永波
张鸣之
杨旭东
肖锐铧
刘明学
冯振
张永军
王仲复
WANG Lichao;HOU Shengshan;DONG Ying;TIE Yongbo;ZHANG Mingzhi;YANG Xudong;XIAO Ruihua;LIU Mingxue;FENG Zhen;ZHANG Yongjun;WANG Zhongfu(China Institute of Geo-Environment Monitoring(Guide Center of Prevention Technology for Geo-Hazards,MNR),Beijing100081,China;Xi’an Center of China Geological Survey,Xi’an,Shaanxi 710054,China;China Geological Survey of Chengdu Center,Chengdu,Sichuan 610081,China;Gansu Institute of Geological Environment Monitoring,Lanzhou,Gansu 730050,China;Qinghai Provincial General Geological and Environmental Monitoring Station,Xining,Qinghai 810000,China)
出处
《中国地质灾害与防治学报》
CSCD
2024年第3期108-118,共11页
The Chinese Journal of Geological Hazard and Control
基金
中国地质调查局地质调查项目(DD20221748,DD20190645,DD20160280)。
关键词
地质灾害
地震
甘肃积石山
黄土
风险防控
geohazard
earthquake
Jishishan County of Gansu Province
loess
risk prevention and control
作者简介
第一作者:王立朝(1972-),男,博士,教授级高级工程师,从事地质灾害调查评价与地质灾害形成机理与防治研究。E-mail:wanglichao@mail.cgs.gov.cn;通讯作者:侯圣山(1977-),男,博士,教授级高级工程师,主要从事地质灾害调查监测相关研究。E-mail:houshengshan@mail.cgs.gov.cn。
