Controls of preferential orientation of earthquake- and rainfall-triggered landslides in Taiwan's orogenic mountain belt

Yi-Chin Chen, Kang Tsung Chang, Su-Fen Wang, Jr Chuan Huang, Cheng Ku Yu, Jien-Yi Tu, Hone Jay Chu, Cheng Chien Liu

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Landsliding usually occurs on specific hillslope aspect, which may reflect the control of specific geo-environmental factors, triggering factors, or their interaction. To explore this notion, this study used island-wide landslide inventories of the Chi-Chi earthquake in 1999 (MW = 7.6) and Typhoon Morakot in 2009 in Taiwan to investigate the preferential orientation of landslides and the controls of landslide triggers and geological settings. The results showed two patterns. The orientations of earthquake-triggered landslides were toward the aspect facing away from the epicenter in areas with peak ground acceleration (PGA) ≥ 0.6 g and landslide ratio ≥ 1%, suggesting that the orientations were controlled by seismic wave propagation. Rainfall-triggered landslides tended to occur on dip slopes, instead of the windward slopes, suggesting that geological settings were a more effective control of the mass wasting processes on hillslope scale than the rainfall condition. This study highlights the importance of the endogenic processes, namely seismic wave and geological settings, on the predesigned orientation of landslides triggered by either earthquake or rainfall, which can in turn improve our knowledge of landscape evolution and landslide prediction.

Original languageEnglish
Pages (from-to)1661-1674
Number of pages14
JournalEarth Surface Processes and Landforms
Volume44
Issue number9
DOIs
Publication statusPublished - 2019 Jul 1

Fingerprint

landslide
natural disaster
Taiwan
earthquake
rainfall
mountain
hillslope
seismic wave
environmental factors
mass wasting
landscape evolution
typhoon
interaction
earthquake epicenter
wave propagation
dip
environmental factor
prediction

All Science Journal Classification (ASJC) codes

  • Geography, Planning and Development
  • Earth-Surface Processes
  • Earth and Planetary Sciences (miscellaneous)

Cite this

Chen, Yi-Chin ; Chang, Kang Tsung ; Wang, Su-Fen ; Huang, Jr Chuan ; Yu, Cheng Ku ; Tu, Jien-Yi ; Chu, Hone Jay ; Liu, Cheng Chien. / Controls of preferential orientation of earthquake- and rainfall-triggered landslides in Taiwan's orogenic mountain belt. In: Earth Surface Processes and Landforms. 2019 ; Vol. 44, No. 9. pp. 1661-1674.
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Controls of preferential orientation of earthquake- and rainfall-triggered landslides in Taiwan's orogenic mountain belt. / Chen, Yi-Chin; Chang, Kang Tsung; Wang, Su-Fen; Huang, Jr Chuan; Yu, Cheng Ku; Tu, Jien-Yi; Chu, Hone Jay; Liu, Cheng Chien.

In: Earth Surface Processes and Landforms, Vol. 44, No. 9, 01.07.2019, p. 1661-1674.

Research output: Contribution to journalArticle

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