HAZARD ESTIMATION FOR LANDSLIDES TRIGGERED BY EARTHQUAKES AND RAINFALL (ABURRÁ VALLEY-COLOMBIA) HAZARD ESTIMATION FOR LANDSLIDES TRIGGERED BY EARTHQUAKES AND RAINFALL (ABURRÁ VALLEY-COLOMBIA)

Abstract

This article presents a hazard estimation for landslides triggered by earthquakes and rainfall in the Aburrá Valley in Colombia using a geographic information systems (GIS) platform. To carry out the estimation, a model that considers the topographical, geological, geotechnical, and hydrological characteristics of the studied area was developed. The model used is based on the Newmark’s pseudostatic model and uses a probabilistic approach based on the technique of first order and second moment -FOSM-. The process calculates the probability of occurrence of a landslide triggered by an earthquake that produces an acceleration (Ah), considering the uncertainty of the geotechnical parameters and conditions of soil saturation.