Evaluating critical rainfall conditions for large-scale landslides by detecting event times from seismic records

Hsien Li Kuo, Guan Wei Lin, Chi Wen Chen, Hitoshi Saito, Ching Weei Lin, Hongey Chen, Wei An Chao

研究成果: Article同行評審

21 引文 斯高帕斯(Scopus)

摘要

One purpose of landslide research is to establish early warning thresholds for rainfall-induced landslides. Insufficient observations of past events have inhibited the analysis of critical rainfall conditions triggering landslides. This difficulty may be resolved by extracting the timing of landslide occurrences through analysis of seismic signals. In this study, seismic records of the Broadband Array in Taiwan for Seismology were examined to identify ground motion triggered by large landslides that occurred in the years 2005 to 2014. A total of 62 landslide-induced seismic signals were identified. The seismic signals were analyzed to determine the timing of landslide occurrences, and the rainfall conditions at those times-including rainfall intensity (I), duration (D), and effective rainfall (Rt)-were assessed. Three common rainfall threshold models (I-D, I-Rt, and Rt-D) were compared, and the crucial factors of a forecast warning model were found to be duration and effective rainfall. In addition, rainfall information related to the 62 landslides was analyzed to establish a critical height of water model, (I-1.5) .D = 430.2. The critical height of water model was applied to data from Typhoon Soudelor of 2015, and the model issued a large landslide warning for southern Taiwan.

原文English
頁(從 - 到)2877-2891
頁數15
期刊Natural Hazards and Earth System Sciences
18
發行號11
DOIs
出版狀態Published - 2018 11月 6

All Science Journal Classification (ASJC) codes

  • 一般地球與行星科學

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