DATABASE OF LANDSLIDES TRIGGERED BY 2015 GORKHA(NEPAL) MW7.8 EARTHQUAKE |
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| Authors: | XU Chong TIAN Ying-ying SHEN Ling-ling MA Si-yuan XU Xi-wei ZHOU Ben-gang HUANG Xue-qiang MA Jun-xue CHEN Xi |
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| Institution: | 1.Key Laboratory of Active Tectonics and Volcano, Institute of Geology, China Earthquake Administration, Beijing 100029, China;2.Beijing Meteorological Information Center, Beijing Meteorological Service, Beijing 100089, China;3.Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China;4.School of Engineering and Technology, China University of Geosciences(Beijing), Beijing 100083, China |
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| Abstract: | In this study, a detailed database of landslides triggered by the 25 April 2015 Gorkha (Nepal)MW7.8 earthquake is constructed based on visual interpretation of pre- and post-earthquake high-resolution satellite images and field reconnaissance. Results show the earthquake triggered at least 47 200 landslides, which have a NWW direction spatial distribution, similar with the location and strike of the seismogenic fault. The landslides are of a total area about 110km2 and an oval distribution area about 35 700km2. On the basis of a scale relationship between landslide area (A)and volume (V), V=1.314 7×A1.208 5, the total volume of the coseismic landslides is estimated to be about 9.64×108m3. In the oval landslide distribution area, the landslide number density, area density, and volume density were calculated and the results are 1.32km-2, 0.31%, and 0.027m, respectively. This study provides a detailed and objective inventory of landslides triggered by the Gorkha earthquake, which provides very important and essential basic data for study of mechanics of coseismic landslides, spatial pattern, distribution law, and hazard assessment. In addition, the landslide database related to an individual earthquake also provides an important earthquake case in a subduction zone for studying landslides related to multiple earthquakes from a global perspective. |
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| Keywords: | Gorkha MW7 8 earthquake coseismic landslide landslide number landslide area visual interpretation |
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