Interpretation of the Spatial Distribution Characteristics of the Co-seismic Landslides Induced by the 1920 Haiyuan M81/2 Earthquake Using Remote Sensing Images  

作　　者：ZHANG Weiheng XU Yueren DU Peng LI Wenqiao TIAN Qinjian CHEN Lize 

机构地区：[1]Key Laboratory of Earthquake Prediction,Institute of Earthquake Forecasting,China Earthquake Administration,Beijing 100036,China [2]State Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration,Beijing 100029,China

出　　处：《Earthquake Research in China》2020年第4期523-545,共23页中国地震研究（英文版）

基　　金：Received on April 20th,2020;revised on August 14th,2020.This project is jointly sponsored by Fundamental Scientific Research Fund in the IEF,CEA(2017IES010102,2019IEF0201,2017IES010101,);the National Natural Science Foundation of China(42072248);the Seismic Active Fault Exploration Project based on High-resolution Remote Sensing Interpretation Technology by Department of Earthquake Damage Defense,CEA(15230003).

摘　　要：Analyzing the spatial distribution characteristics of earthquake-induced secondary disasters based on advanced techniques is significantly important,especially in understanding the process of strong earthquakes in the Loess Pateau.Using ArcGIS,this study interprets multi-temporal high-resolution satellite images,field investigation data,and historical seismic records.Major conclusions are obtained as follows:①Landslides induced by the Haiyuan earthquake are mainly distributed in the intersection area of the end of the Haiyuan fault and Liupanshan fault,as indicated by multiple dense distribution centers;②The landslide distribution of the Haiyuan Earthquake is determined by the distance to the fault,topographic relief,slope,lithology,and other factors.In detail,the closer the distance to the fault,the greater the density of the landslide.The greater the slope and relief of the terrain,the greater the density and the smaller the average area of a landslide.Compared with tertiary strata,Quaternary strata has a larger average area,and the density of the landslides is smaller;③The density curve of the death toll in the Haiyuan earthquake can be used as a reference for the distribution of co-seismic landslides.Several Haiyuan co-seismic landslides are distributed in the Tongwei landslide area;however,the major landslides here are induced by the 1718 Tongwei earthquake rather than the 1920 Haiyuan earthquake;④The co-seismic landslides of the Haiyuan earthquake exhibits the“slope effect”in the south-west plate of Haiyuan fault,presenting the dominant sliding direction towards the fault and epicenter;however,the“slope effect”is not evident in the northeast plate of the fault.

关 键 词：1920 Haiyuan earthquake Earthquake-induced landslide Slope effect 

分 类 号：P315.9[天文地球—地震学] P642.22[天文地球—固体地球物理学]