Generating event-based landslide maps in a data-scarce Himalayan environment for estimating temporal and magnitude probabilities

Ghosh, Saibal, van Westen, Cees J., Carranza, Emmanuel John M., Jetten, Victor G., Cardinalli, Mauro, Rossi, Mauro, and Guzzetti, Fausto (2011) Generating event-based landslide maps in a data-scarce Himalayan environment for estimating temporal and magnitude probabilities. Engineering Geology, 128. pp. 49-62.

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Abstract

Event-based landslide maps display landslide events of different magnitudes that are associated with a single major trigger. Event-based landslide maps allow the estimation of spatio-temporal probabilities of landslide events that are required for the assessment of landslide hazard. In this paper, we discuss the generation of event-based landslide inventory maps for a region in Darjeeling Himalayas (India) with limited historical landslide information. We used eight different sets of source data, spanning the period from 1968 to 2007, which include topographic maps, satellite images and post-event field maps. For each period we mapped the various landslide types, and calculated landslide density and activity in individual terrain units to analyze changes in the spatial behavior of landslides through time. For the assessment of the temporal landslide probability, we used landslide event-days and associated daily and antecedent rainfall amounts in a multivariate statistical analysis to model the temporal relationship between landslide events and the amount of triggering rainfall. For estimating the magnitude probability, we applied magnitude–frequency analysis for the different event-based landslide maps using landslide area (m²) as a proxy. Despite the incompleteness of the source data sets used, the resulting landslide inventory maps can be used successfully in determining temporal and magnitude probabilities of future landslides.

Item ID: 27316
Item Type: Article (Research - C1)
ISSN: 1872-6917
Keywords: event-based landslide inventory; frequency–magnitude relation; temporal probability; magnitude probability; Darjeeling Himalaya
Date Deposited: 31 May 2013 06:22
FoR Codes: 04 EARTH SCIENCES > 0406 Physical Geography and Environmental Geoscience > 040604 Natural Hazards @ 30%
04 EARTH SCIENCES > 0406 Physical Geography and Environmental Geoscience > 040607 Surface Processes @ 30%
01 MATHEMATICAL SCIENCES > 0103 Numerical and Computational Mathematics > 010399 Numerical and Computational Mathematics not elsewhere classified @ 40%
SEO Codes: 96 ENVIRONMENT > 9610 Natural Hazards > 961008 Natural Hazards in Mountain and High Country Environments @ 100%
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