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Interpretation of the Spatial Distribution Characteristics of the Co-seismic Landslides Induced by the 1920 Haiyuan M8 1/2 Earthquake Using Remote Sensing Images
ZHANG Weiheng1,2, XU Yueren1, DU Peng1, LI Wenqiao1, TIAN Qinjian1, CHEN Lize1
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
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:① Landslides 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; ② The 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; ③ The 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; ④ The 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
DOI:10.19743/j.cnki.0891-4176.202004003
分类号:
基金项目: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), and the Seismic Active Fault Exploration Project based on High-resolution Remote Sensing Interpretation Technology by Department of Earthquake Damage Defense, CEA (15230003).
Interpretation of the Spatial Distribution Characteristics of the Co-seismic Landslides Induced by the 1920 Haiyuan M8 1/2 Earthquake Using Remote Sensing Images
ZHANG Weiheng1,2, XU Yueren1, DU Peng1, LI Wenqiao1, TIAN Qinjian1, CHEN Lize1
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
Abstract:
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:① Landslides 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; ② The 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; ③ The 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; ④ The 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.
Key words:  1920 Haiyuan earthquake  Earthquake-induced landslide  Slope effect