Epicentral Distance Distribution of Seismic Landslides in 5.12 Wenchuan Earthquake

摘要

It has been two years after the Wenchuan earthquake taking place in 12 May, 2008. Researchers are still concerned about what happens to the seismic geohazards. By field investigation and statistical analysis in Chengdu City, the distribution of landslides triggered by the earthquake was analyzed and the correlation analysis between rainfall and seismic landslides were conducted in the extremely earthquake stricken region in Chengdu city and the conclusions are as follows: Geohazards triggered by the Wenchuan earthquake reached the historical peak in numbers. Since then the rainfall has become a major triggering factor of landslide occurrence in the earthquake hit regions and the geohazards will be much more substantial in the future decades. The regional distribution of geohazards follow the 2 linear law with the macro-epicenter, large scale landslides are located within 14.9 km from the macro-epicenter, moderate and small scale landslides within S2.7 km from the macro-epicenter.