The Introduce of Indices to Predict Geology Unites Susceptibility to Coseismic Landslides; Manjil Earthquake as a Case study

Subject Areas :

M.A Rajabi ¹ (عضو هیئت علمی دانشگاه آزاد اسلامی واحد محلات، محلات، ایران)

Received: 2016-09-06 Accepted : 2016-09-06 Published : 2009-09-23

Keywords: Manjil earthquake, Landslides caused by earthquakes, GIS, Susceptibility Index, Frequency Index,

Abstract :

The analysis of distribution and characteristics of landslides triggered by earthquakes is important tounderstand the areas may be susceptible to landsliding in the next earthquakes. One of the mostsignificant effects of the Manjil earthquake (M=7/7, 20/6/1990) was triggering landslides over anextensive area. In this study; the factors of these landslides such as slope, slope aspect, elevation,lithological unites and Arias intensity were investigated using GIS in an area close to the earthquakeepicenter. In the next step, two indices called Susceptibility Index (SI) and Frequency Index (FI)presented to predict the location of future earthquake-induced landslides. Finally, landslidessusceptibility in the study area has been rated based on these indices. The output of this study can beused to predict landslide susceptible areas in the future earthquakes and to distinguish hazard zones inthe overall study area.