Abstract
ABSTRACTThe main objective of this study is to evaluate the performances of different earthquake-induced landslides susceptibility mapping models at mountainous regions in China. At first, 160 earthquake-induced landslide points were identified from field investigations. Concurrently, based on the results of a literature review and the field investigation, 12 influencing factors were considered, and the corresponding thematic layers were generated using geographic information system (GIS) technology. Subsequently, 20 groups with a fixed number of cells were collected as a common training dataset for the two different models, based on a random selection from the entire database (including landslide cells and no-landslide cells). The neural network (NN) model and logistic regression (LR) model were developed with R software. Finally, earthquake-induced landslides susceptibility maps of Wenchuan county were produced, very low, low, medium, high and very high susceptibility zones cover. The validation results indicate that the landslide data from field investigations are in good agreement with the evaluation results, and the LR model has a slightly better prediction than the NN model in this case. In general, the NN model and LR models are satisfactory for susceptibility mapping of earthquake-induced landslides at mountainous regions.
Highlights
Landslide is one of the types of natural disasters that cause severe damage, including human and economic losses (Chen and Huang 2013; Wen 2015)
For the neural network (NN) model, more than 67.5% of field landslides points were located in approximately 6.7% coverage, but only about 14.3% of the field landslide points were located in approximately 87.8% coverage
The NN and the logistic regression (LR) models were applied in Wenchuan county to produce accurate maps of earthquake-induced landslide susceptibility
Summary
Landslide is one of the types of natural disasters that cause severe damage, including human and economic losses (Chen and Huang 2013; Wen 2015). China has a long history of earthquakes: a neighbouring region was affected by M7.3 event in 1933 (Brown et al 2012). According to existing statistical data, 301 earthquakes struck China in the past 25 years (from 1990 to 2014), and there has been an average annual incidence rate of 12 times (Liu et al 2014). The M7.9 Wenchuan earthquake in the Sichuan province has been the most destructive and deadly earthquake for more than 30 years (Brown et al 2012). After the 12 May 2008 earthquake, the Sichuan Provincial Department of Land and Resources organized and implemented a geological disaster emergency investigation work of 36 geological disaster-prone counties (cities, districts). Numerous members of our team participated in the geological disasters investigation in Wenchuan county, which was undertaken by the Chongqing Shutong Geotechnical
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