Analysis of the Secondary Geological Disasters that Triggered by 5.12 Wenchuan Earthquake
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    Abstract:

    Abstract: The devastating Ms8.0 earthquake struck Wenchuan China on 12 May 2008. It caused considerable damage and lots of secondary geological hazards such as landslides, collapses, mud-rock flows et al. After the interpretation of remote sensing images the geological hazards database was built. Using GIS means, the area of geological hazards in different slopes and aspects was calculated, and in which slopes and aspects that the geological hazards were apt of occurred as well as the distance and orientation relationship between the geological hazards and the epicenter were also analyzed. In addition, three kinds of buffer analysis was processed in order to analyze the spatial distribute rules of the geological hazards. The result shows that: (1) there are more than 5093 geological hazards were triggered by the earthquake, the area of all geological hazards were more than 958 sq. km. (2) Most of the geological hazards were concentrated in 30°~44°slopes, and the 42°was a inflexion that probability of the geological hazards occurred increased quickly when the slope was more than 42°. Geological hazards distribution also shows a correlation with the orientation of mountain slopes, the geological hazards were mainly happened at the aspect that faced the seismic wave. (3) With the increasing of epicenter distance, the probability of occurrence of geological hazards decreased gradually. The occurred probability of geological hazards deceased especially quickly within the 40km epicenter distance, and the average slope of geological hazards in every buffer were about 4°larger than the average slope of the buffer they located.(4) The geological hazards were mainly distributed around the seismic faults, about 64.17% of geological hazards were distributed within 10km around the main seismic fault zone. (5) The geological hazards occurred probability was much higher in the area with high seismic intensity than in the area with low seismic intensity. The geological hazards occurred probability was 14.5% in the area with Ⅺ degree of intensity while it was only 0.01% in the area with Ⅶ degree of intensity.

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sun xiao yu.2010. Analysis of the Secondary Geological Disasters that Triggered by 5.12 Wenchuan Earthquake[J]. Acta Geologica Sinica,84(9):1283-1291

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History
  • Received:January 01,1900
  • Revised:December 15,2009
  • Adopted:April 28,2010
  • Online: September 14,2010
  • Published: