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Susceptibility assessment of earthquake-triggered landslides in El Salvador using logistic regression
García Rodríguez, María José and Malpica Velasco, José Antonio and Benito Oterino, Belen and Díaz, Manuel
Susceptibility assessment of earthquake-triggered landslides in El Salvador using logistic regression.
"Geomorphology", v. 95
This work has evaluated the probability of earthquake-triggered landslide occurrence in the whole of El Salvador, with a Geographic Information System (GIS) and a logistic regression model. Slope gradient, elevation, aspect, mean annual precipitation, lithology, land use, and terrain roughness are the predictor variables used to determine the dependent variable of occurrence or nonoccurrence of landslides within an individual grid cell. The results illustrate the importance of terrain roughness and soil type as key factors within the model — using only these two variables the analysis returned a significance level of 89.4%. The results obtained from the model within the GIS were then used to produce a map of relative landslide susceptibility.
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