2022年泸定M_(S)6.8地震的同震地表变形特征及地震地质启示  

Co-seismic Surface Deformation Characteristics and Seismic Geological Enlightenment of the Luding,Sichuan M_(S)6.8 Earthquake in 2022

作　　者：李路伟 余中元 陈柏旭 郑荣荧 王世元[3] 赵钱 LI Luwei;YU Zhongyuan;CHEN Baixu;ZHENG Rongying;WANG Shiyuan;ZHAO Qian(Institute of Disaster Prevention,Sanhe 065201,China;Beijing Disaster Prevention Technology Co.Ltd,Beijing 101100,China;Sichuan Earthquake Agency,Chengdu 610041,China)

机构地区：[1]防灾科技学院,河北三河065201 [2]北京防灾科技有限公司,北京101100 [3]四川省地震局,四川成都610041

出　　处：《防灾科技学院学报》2022年第4期75-87,共13页Journal of Institute of Disaster Prevention

基　　金：中央高校基本科研业务费重点项目(ZY20215110);北京防灾科技有限公司研发专项(FZKJYF202201)。

摘　　要：2022年泸定地震的同震地表变形特征是认识鲜水河断裂强震破裂行为和评估其未来强震风险的重要依据。应用遥感影像解译、大比例尺地质地貌填图、探槽古地震分析和无人机航空摄影测量等方法,调查了本次地震地表破裂、滑坡和崩塌等同震变形特征。综合同震变形带的分布特征及震源机制解研究结果认为:本次地震类型主要表现为左旋走滑;地表裂缝集中发育在燕子沟、磨西镇、猛虎岗、幸福村一带,整体沿NNW方向断续展布,长约35km,最大垂直位错(15±1)cm,伴随滑坡和崩塌等地震地质灾害。滑坡分为东、西两部分,整体分布受断裂带和大渡河水系的空间展布影响较大。西部滑坡区以燕子沟至爱国村一带最为严重,滑坡体规模大,范围广,整体呈NNW向,平行于鲜水河断裂磨西段延伸约40km;东部滑坡区主要分布于得妥镇以北约5km处至泸定县城西南端,滑坡体沿大渡河两岸呈NE向展布,延伸约10km。根据现有资料,并结合野外调查结果和构造类比等方法,讨论认为巴颜喀拉块体及邻近地区短期内仍可能是强震活动的高风险地区,块体南边界带鲜水河断裂西北端当江段的强震危险性尤需高度重视。The co-seismic surface deformation characteristics of the 2022 Luding,Sichuan MS6.8 Earthquake in 2022 serve as an important basis for understanding the rupture behavior of strong earthquakes in the Xianshuihe Fault and evaluating the risk of its future strong earthquakes.In this paper,using remote sensing image interpretation,large-scale geological and geomorphic mapping,historic earthquake analysis of trench exploration and aerial photogrammetry of unmanned aerial vehicle,we investigated the seismic deformation characteristics of the earthquake such as surface rupture,landslide and collapse.Combined the distribution characteristics of the co-seismic deformation zone with the focal mechanism,it is concluded that this earthquake is mainly characterized by the sinistral strike-slip.It also reveals that the surface fractures are concentrated in the area of Yanzigou,Moxi Town,Menghugang,and Xingfu Village,and the fractures on the whole extend along the NNW direction with a length of about 35km and a maximum vertical displacement of(15±1)cm,accompanied by serious seismic and geological disasters such as landslides and collapses etc.The landslides are divided into the eastern part and the western part,and its overall distribution is greatly affected by the spatial distribution of the fault zone and the Dadu River System.In the western landslide area,the area from Yanzigou to Aiguo Village is affected the most with the landslide mass being large in scale,wide in scope,and generally in NNW direction,and extending about 40km parallel to the Moxi section of Xianshuihe Fault.The eastern landslide area is mainly distributed between about 5km north of Detuo Town and the southwest end of Luding County,and the landslide spreads in NE direction for about 10km along both sides of Dadu River.Based on the available data,field investigation results and structural analogy methods,we conclude that it still exits high risk areas for strong earthquake activity in the Bayan Har Block and its adjacent areas in the short term,while the s

关 键 词：泸定地震 鲜水河断裂 同震变形 滑坡灾害 强震危险性 

分 类 号：P315.2[天文地球—地震学]