Remote sensing survey of secondary geological disasters triggered by Lushan earthquake in Sichuan Province and tentative discussion on disaster characteristics
GUO Zhaocheng, TONG Liqiang, ZHENG Xiongwei, QI Jianwei, WANG Jianchao
China Aero Geophysical Survey and Remote Sensing Center for Land and Resources, Beijing 100083, China
Abstract：On April 20,2013,a catastrophic earthquake with MS 7.0 occurred in Lushan County,Sichuan Province. Using the multi-source remote sensing data acquired before and after the earthquake,the authors analyzed the secondary geological disasters and their spatial distribution based on interactive visual interpretation and field survey. The remote sensing investigation results have shown that the earthquake has triggered 1 678 secondary geological disasters,covering an area of about 8.354 km2. The secondary geological disasters are characterized by smaller scale and dominance of collapse and rockfall types. Using the terrain data before the earthquake,the authors analyzed the relationship between the distribution of secondary geological disasters and the elevation and slope. Statistical and analytical results show that 95% of the secondary geological disasters are located in the area with the elevation between 750~1 850 m,and 82.5% of the secondary geological disasters are located in the area with the slope between 15 °~ 50°. With the increasing slopes,however, the incidence of the secondary geological disasters increases significantly. The secondary geological disasters assume remarkable linear arrangements, with some distributed along the NE-trending seismogenic fault and the others along the mountain ridge and river valley. The results obtained by the authors provide some important information for the emergency decision-making,rescue and reconstruction after the earthquake.
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2014, Vol. 26 
