Landslides Triggered by the 3 August 2014 Ludian(China) Mw 6.2 Earthquake: An Updated Inventory and Analysis of Their Spatial Distribution

作     者：Weiying Wu Chong Xu Xiaoqing Wang Yingying Tian Fei Deng Weiying Wu;Chong Xu;Xiaoqing Wang;Yingying Tian;Fei Deng

作者机构：Institute of Earthquake Forecastings China Earthquake AdministrationBeijing 100036China Institute of Crustal DynamicsChina Earthquake AdministrationBeijing 100085China Key Laboratory of Active Tectonics and VolcanoInstitute of GeologyChina Earthquake AdministrationBeijing 100029China 

出 版 物：《Journal of Earth Science》 (地球科学学刊（英文版）)

年 卷 期：2020年第31卷第4期

页      面：853-866页

核心收录：

学科分类：070801[理学-固体地球物理学] 081803[工学-地质工程] 07[理学] 08[工学] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 

基　　金：supported by the National Key Research and Development Program of China (No. 2017YFB0504104) the National Natural Science Foundation of China (No. 41661144037) 

主　　题：2014 Ludian earthquake coseismic landslides landslide inventory spatial distribution 

摘      要：The 3 August 2014 Ludian, Yunnan, China Mw 6.2(Ms 6.5) earthquake triggered a large number of coseismic landslides. Based on pre-and post-quake high-resolution optical satellite images, this study established a new, complete and objective database of these landslides with field investigations. The updated inventory shows that this earthquake triggered at least 12 817 landslides with a total occupation area of 16.33 km2, covering a nearly circular area about 600 km2, which all exceed those in our previous work and other relevant studies. In addition, we used this database to examine the correlations of the landslides with topographic, geologic, and seismic factors. Results show that the landslides occurred mostly at places with slope gradients 10o–40o, showing an increase tendency with steeper slopes. Affected by the propagation direction of the earthquake rupture, the eastward-facing slopes are more prone to landsliding. The differences between the landslide susceptibility in different strata indicate that lithology is also an important controlling factor. The landslide density of the places with peak ground acceleration(PGA) greater than 0.16 g is obviously larger than those with PGA less than 0.16 g. Meanwhile, the greater the distance from the epicenter, the lower the susceptibility of landslides is. This study suggests that when using satellite images to create coseismic landslide inventories, it should meet certain conditions, including high resolution, whole coverage, and timely data collection. The correct criteria of coseismic landslide inventorying also should be followed. Such inventories can provide a reliable basis for hazard assessment of earthquake-triggered landslides and other quantitative studies.