The Volume Calculation Method of Rock Collapses and Loess Landslides Triggered by the 1556 AD Huaxian M81/2 Earthquake in Shaanxi Province, China  

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

机构地区：[1]Key Laboratory of Earthquake Prediction,Institute of Earthquake Forecasting,China Earthquake Administration,Beijing 100036,China

出　　处：《Earthquake Research in China》2020年第4期599-616,共18页中国地震研究（英文版）

基　　金：Received on April 29th,2020;revised on June 5th,2020.This project is 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 Highresolution Remote Sensing Interpretation Technology by Department of Earthquake Damage Defense,CEA(15230003).

摘　　要：Accurate volume calculation of each individual landslide triggered by strong historical earthquakes can help understand the characteristics of the typical earthquake-induced landslides,thus providing significant information for the modification of the focal parameters of historical earthquakes.In this study,we select one rock fall and three loess landslides triggered by the 1556 AD Huaxian M8⅟􀄟earthquake,compute their volumes using the low-altitude high-precision Unmanned Aerial Vehicle(UAV)photogrammetry and landslide profile restoration methods.The results show that:①the whole influencing area of the Huangjiagou Rock Fall is approximately 3.03×105 m2 and the area of the collapsed rock accumulated at the slope foot is 3.33×104 m2,accounting for approximately 10%of the entire influencing range.However,the estimated volume of the collapsed rock is only 0.699×106 m3,indicating a rock fall with large influencing range but limited collapsed rock;②the geological form of thethree loess landslides are preserved intactly,with volumes of 0.283×108 m3,0.074×108 m3,and 0.377×108 m3.These important geological hazard relics reflect the strong vibrations and severe casualties in the meizoseismal area;③loess landslides are the key reason of the serious death toll in the hilly-gully loess area.Our new method can be used to estimate the influencing area and the actual volume of each individual landslide,and rationally evaluate the role of earthquake landslides in the disaster.In addition,quantitative research on secondary disasters triggered by strong historical earthquakes is beneficial for understanding the surface process and focal parameters of the earthquakes.

关 键 词：1556 AD Huaxian earthquake Rock fall Loess landslide Volume calculation 

分 类 号：P642.22[天文地球—工程地质学] P315.9[天文地球—地质矿产勘探]