2023年12月18日甘肃积石山M_(S)6.2地震触发次生灾害快速评估  

Rapid Assessment of Coseismic Hazards Induced by Jishishan M_(S)6.2 Earthquake on December 18,2023 in Gansu Province,Northwest China

作　　者：徐岳仁[1] 窦爱霞[1] 李智敏[2] 梁朋[1] 梁泽毓 陆玲玉 XU Yue-ren;DOU Ai-xia;LI Zhi-min;LIANG Peng;LIANG Ze-yu;LU Ling-yu(Key Laboratory of Earthquake Prediction,Institute of Earthquake Forecasting,China Earthquake Administration,Beijing 100036,China;Qinghai Earthquake Agency,Xining 810001,China)

机构地区：[1]中国地震局地震预测研究所,地震预测重点实验室,北京100036 [2]青海省地震局,青海西宁810001

出　　处：《地震》2024年第1期209-215,共7页Earthquake

基　　金：青海省重点研发与转化计划项目(2022-SF-138);国家自然科学基金项目(42041006,42072248)。

摘　　要：2023年12月18日甘肃积石山县发生M_(S)6.2地震,该次地震触发官亭盆地中川乡金田泥流灾害,造成严重的破坏和人员伤亡。通过震前、震后的高分辨率卫星影像对比分析,初步判断此次地震没有引发大型同震滑坡与密集砂土液化,但是震前震中区发育的大量大型黄土滑坡和密集液化砂脉是由更老的地震事件触发。金田泥流灾害是物源区高含水量黏性土在强震动条件下沿沟谷发生流动所致,其发生可能与人类的耕作方式(引黄灌区震前冬季灌溉导致浅表土层含水量提高)有关。On December 18,2023,an M_(s)6.2 earthquake occurred in Jishishan County,Gansu Province.The earthquake triggered a mudflow disaster in Jintian Village,Zhong-chuan Township,Guanting Basin,causing serious damage and casualties.Comparative analysis of pre-and post-earthquake high-resolution satellite/aerial images shows that the Jishishan M_(s)6.2 earthquake did not trigger large-scale coseismic landslides and dense soil liquefaction,but dense large-size loess landslides and soil liquefaction pits developed before the earthquake maybe triggered by paleoearthquake event(s).The mudflow disaster in Jintian village was caused by the flow of clay soil with high water content in the source ar-ea under vibration conditions,which was possibly related to the human cultivation(winter irrigation from the Yellow River).

关 键 词：金田泥流 积石山 青藏高原 地震灾害链 

分 类 号：P315.6[天文地球—地震学]