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JDR Vol.10 No.5 pp. 966-972
(2015)
doi: 10.20965/jdr.2015.p0966

Paper:

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Analysis of Factors Triggering Shallow Failure and Deep-Seated Landslides Induced by Single Rainfall Events

Teng-To Yu, Ting-Shiuan Wang, and Youg-Sin Cheng

Department of Resources Engineering, National Cheng Kung University
1 University Rd., Tainan, Taiwan

Received:
February 9, 2015
Accepted:
July 28, 2015
Published:
October 1, 2015
Creative Commons License
Keywords:
shallow landslide, deep-seated landslide, landslide susceptibility analysis, hazard map
Abstract
Earthquakes, rainfall, or a combination of both can trigger landslides, which can be classified into shallow and deep-seated types according to scale. Landslide risk potential can be charted according to the spatiotemporal characteristics of a combination of triggering factors that can be collated for similar historical events by various methods. The geographic information system (GIS) and the instability index method are two approaches commonly used to perform such a task; however, the nature of the event and the quality of imported data affect the degree of bias of model predictions against real-time values. To identify the differences between shallow and deep-seated landslides, 324 cases of landslides triggered by single rainfall events in Taiwan are analyzed in this study. It is determined that the principal factor governing shallow failure for rainfall-induced landslides is slope and that deep-seated failure is controlled by the amount of accumulated rainfall. By arranging the weighting, these factors could predict 93% and 75% of the occurrences of shallow and deep-seated landslides, respectively, based on a pre-event digital terrain model.
Cite this article as:
T. Yu, T. Wang, and Y. Cheng, “Analysis of Factors Triggering Shallow Failure and Deep-Seated Landslides Induced by Single Rainfall Events,” J. Disaster Res., Vol.10 No.5, pp. 966-972, 2015.
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