Characteristics of landslides triggered by the 2013 ML6.5 Nantou, Taiwan, earthquake

Earth, Planets and Space

Yi-Chin Chen¹  Bing Sheng Wu²  Ya-Shien Lin³  Ray Y. Chuang⁴ 

[1] Department of Geography, National Changhua University of Education, Changhua City, Taiwan;Department of Geography, National Taiwan Normal University, Taipei, Taiwan;Department of Geography, National Taiwan University, Taipei, Taiwan;Department of Geography, National Taiwan University, Taipei, Taiwan;NTU Research Center for Future Earth, Taipei, Taiwan;

关键词: Earthquake-induced landslides;    Coseismic deformation;    Mass movement;    Landslide aspect;   

DOI  :  10.1186/s40623-021-01560-8

来源: Springer

【 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

【 授权许可】

CC BY