Earthquake-induced rock fall hazard zonation of Varzegha-Ahar region in northwest Iran: a comparison of quantitative and qualitative approaches
Publish Year: 1395
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JSEE-18-2_002
تاریخ نمایه سازی: 8 آبان 1400
Abstract:
In this study three earthquake-induced rock fall hazard maps of the regions affected by Varzeghan-Ahar earthquake doublet are presented. On August ۱۱th ۲۰۱۲ an earthquake doublet (Mw= ۶.۵ and, Mw= ۶.۳) 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 ۱۵۰ rock falls were recorded, the farthest one approximately ۴۵ 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 ۰.۹۲۷, ۰.۹۰, and ۰.۸۹۸ 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.
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Authors
Mohammadreza Mahdavifar
IIEES
Faradjollah Askari
IIEES
Parham Memarian
IIEES
Seyed Majid Seyedimorad
University of Tehran
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