Journal of Seismology and Earthquake Engineering

Journal of Seismology and Earthquake Engineering

Earthquake-induced rock fall hazard zonation of Varzegha-Ahar region in northwest Iran: a comparison of quantitative and qualitative approaches

Document Type : Geotechnical Earthquake Engineering

Authors
Mohammadreza Mahdavifar 1
Faradjollah Askari 1
Parham Memarian 1
Seyed Majid Seyedimorad 2
1 IIEES
2 University of Tehran
Abstract
In this study three earthquake-induced rock fall hazard maps of the regions affected by Varzeghan-Ahar earthquake doublet are presented. On August 11th 2012 an earthquake doublet (Mw= 6.5 and, Mw= 6.3) struck Varzeghan, Ahar and Heris regions (located in Azerbaijan-e-Sharghi province of Iran). Most of the landslides triggered by the earthquakes were rock falls and disrupted rock slides. Several rock fall zones, some with more than 150 rock falls were recorded, the farthest one approximately 45 kilometers away from the earthquake epicenters.A landslide inventory map of the region was prepared. Three methods of Information Value (IV), Logistic Regression (LR), and Analytical Hierarchy Process (AHP) were used for earthquake-induced rock fall hazard zonation. The results from each method were then compared using Receiver Operating Characteristics (ROC) curve. The area under ROC curve (AUC) was 0.927, 0.90, and 0.898 for LR, IV, and, AHP models, respectively. The most accurate rock fall hazard zonation map of the study area resulted from LR method, and IV method is, to a small extent, more accurate than AHP.
Keywords
Landslide Hazard Zonation
rock fall
Earthquake-induced landslides
Varzeghan-Ahar earthquake
Logistic regression
information value
Analytical hierarchy process
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Journal of Seismology and Earthquake Engineering
Volume 18, Issue 2 - Serial Number 2
Spring 2016
Pages 101-116

  • Receive Date 17 October 2015
  • Accept Date 26 December 2020
  • Publish Date 01 May 2016