Characteristics of landslides triggered by the 2013 M L6.5 Nantou, Taiwan, earthquake

Bing Sheng Wu, Ray Y. Chuang*, Yi Chin Chen, Ya Shien Lin

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

摘要

Earthquake-triggered landslides are common disasters of active mountain belts. Due to the lack of earthquake-triggered landslide inventory in Taiwan, it is not intuitive to observe spatial relationships and discover unique patterns between landslides and essential triggers. We examined strong earthquake events in Taiwan after the 1999 Mw7.6 Chi-Chi earthquake and targeted the 2013 ML6.5 Nantou earthquake to create the landslide inventory. We adopted two Landsat-8 satellite images before and after the event to detect landslides, and incorporated a 20-m DEM and rock type data of Taiwan to represent key factors triggering earthquake-induced landslides such as peak ground acceleration (PGA), lithology, slope roughness, slope, and aspect. Based on the analysis of the density of landslides, there are strong correlations between the landslide occurrence and seismic and geomorphic factors. Furthermore, we noticed that the landslide aspects have a systematic tendency towards the northeast, which is not correlated with the dip directions and wave propagation directions. Instead, we found that the northeastward landslide aspect is more associated with the westward–southwestward surface movement at the landslides. We found that the included angles between the landslide aspects and the displacement directions for all the landslides are ~ 100°–180°. The relationship indicated that the coseismic deformation of the Nantou earthquake may play a role in the landslide distribution. Graphical Abstract: [Figure not available: see fulltext.]

原文英語
文章編號7
期刊Earth, Planets and Space
74
發行號1
DOIs
出版狀態已發佈 - 2022 12月

ASJC Scopus subject areas

  • 地質學
  • 空間與行星科學

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