摘要
2023年12月18日,甘肃省临夏回族自治州积石山县发生Ms6.2(Mw5.9)级地震,震源深度10 km。此次地震造成大量的人员伤亡、房屋倒塌和地质灾害。为了对该次地震的震害有初步认识,基于已有文献资料、高精度遥感数据和野外调查数据,本文尝试对该次地震的灾害特征展开分析。结果表明:该次地震为逆冲型事件,发震断裂为拉脊山北缘断裂东段;震源浅叠加松散覆盖层产生了明显的地震波放大效应,使得极震区的地面运动峰值加速度(PGA)异常高,强震动使得房屋大量倒塌;而位于断裂上盘的积石山崩塌及滑坡地质灾害相对不发育,仅在黄土覆盖的官亭盆地产生了数百处小型滑坡和中川乡一处较大规模的地震液化滑坡泥流。
On 2023 December 18,an Ms 6.2(Mw 5.9)seismic event struck Jishishan County,Gansu Province,with a focal depth of 10 km.This earthquake caused a large number of casualties,house collapses,and geohazards.To obtain a preliminary understanding of earthquake-induced hazards,this study discussed some characteristics of the hazards triggered by this event based on existing literature,high resolution remote sensing data,and field investigation data.The results showed this earthquake was a thrust event,where the seismogenic fault was attributed to the north Laji Mt.fault.The strong seismic shaking caused by the shallow earthquake coupled with site amplification of loose surficial layers caused the meizoseismal area to experience extreme seismic shaking,causing numerous house collapses.While fewer landslides occurred in hanging wall areas(e.g.,the Jishishan mountain area),only Guanting Basin,which is covered by loess,was found to be a landslide-prone area due to the hundreds of small landslides and a seismic liquefied earthflow that occurred in this basin.
作者
王运生
赵波
吉锋
李为乐
WANG Yunsheng;ZHAO Bo;JI Feng;LI Weile(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China;Key Laboratory of Mountain Hazards and Earth Surface Processes,and Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610299,China)
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2024年第1期1-8,共8页
Journal of Chengdu University of Technology: Science & Technology Edition
基金
国家自然科学基金项目(41877235,42007273)。
关键词
积石山Ms6.2级地震
地震液化滑坡泥流
地形放大
震害异常
松散堆积层
Jishishan Ms 6.2 earthquake
seismic liquefied landslide earthflow
site amplification
anomalous earthquake-induced hazard
loose surficial layer
