Characteristics of earthquakes in mountain areas and post-earthquake management

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Abstract

Using the Geographic Information Systems (GIS) technique and remote-sensing images and aerial photographs collected from the Wenchuan earthquake region, this chapter analyzes the occurrence of geo-hazards and their correlations with the distance from the co-seismic fault, slope steepness, elevation, and rock type. Our findings show that the geo-hazards triggered by earthquakes are distributed along co-seismic fault and rivers. Specifically, geo-hazards tend to concentrate in areas near the hanging wall of co-seismic fault more than in those near the footwall. The slope's steepness is also a key factor deciding the development of quake-induced geo-hazards, since most of the latter are distributed at the mountain areas within the range of 20-50°. In addition, geo-hazards are found to have a close relationship to the elevation and micro-landform and that thin ridge, isolated or full-face space mountains are most sensitive to seismic waves, and thus have a striking amplification effect on geo-hazards. Lastly, we suggest that the above findings may serve as an important basis for the reconstruction of earthquake-hit mountain regions. © 2011 Springer Science+Business Media, LLC.

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Huang, R., & Li, W. (2011). Characteristics of earthquakes in mountain areas and post-earthquake management. In Managing Fragile Regions: Method and Application (pp. 121–142). Springer New York. https://doi.org/10.1007/978-1-4419-6436-6_7

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