Ten years of landslide development after the Wenchuan earthquake: a case study from Miansi town, China

Ning Li (), Chuan Tang and Tao Yang
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Ning Li: Xihua University
Chuan Tang: Chengdu University of Technology
Tao Yang: Sichuan Chuanjian Geotechnical Survey and Design Institute

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2022, vol. 111, issue 3, No 26, 2787-2808

Abstract: Abstract The earthquake outbreak on 12 May 2008, in Wenchuan County caused long-term instability and frequent geological hazards on the mountain slopes in the earthquake area. Considering Miansi town in the strong earthquake area as an example, this paper analyses the development and characteristics of landslides in the 10 years after the earthquake. We collected five periods of remote sensing images in the 10 years after the earthquake, obtained the corresponding landslide distribution and activity characteristics, and then analysed the development of landslide activity over the 10 years. The total area of the landslides grew intensively from 2008 to 2014, and then the growth rate slowed down significantly after the heavy rainfall event on 10 July 2013. At the same time, the influence of slope, slope aspect, distance to a river channel, elevation, and other factors on the probability of landslides is analysed by using the distribution of the landslides. The areas that are prone to landslides, which mainly include the areas with elevations of 1700–3200 m, the areas with slopes of 30–60°, the areas with aspects of 90°–225° (with north having an aspect of 0°), and the area that are less than 200 m from a river channel, are divided according to the distribution density.

Keywords: Wenchuan earthquake; Debris flow; Landslides; Dynamic evolution; Controlling factors (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1007/s11069-021-05157-y

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