Journal
NATURAL HAZARDS AND EARTH SYSTEM SCIENCES
Volume 18, Issue 3, Pages 709-727Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/nhess-18-709-2018
Keywords
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Funding
- Central Geological Survey, Ministry of Economic Affairs, Taiwan R.O.C.
- Tatun thematic project from the Institute of Earth Sciences, Academia Sinica
- Ministry of Science and Technology, Taiwan R.O.C.
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Several remote sensing techniques, namely traditional aerial photographs, an unmanned aircraft system (UAS), and airborne lidar, were used in this study to decipher the morphological features of obscure landslides in volcanic regions and how the observed features may be used for understanding landslide occurrence and potential hazard. A morphological reconstruction method was proposed to assess landslide morphology based on the dome-shaped topography of the volcanic edifice and the nature of its morphological evolution. Two large-scale landslides in the Tatun volcano group in northern Taiwan were targeted to more accurately characterize the landslide morphology through airborne lidar and UAS-derived digital terrain models and images. With the proposed reconstruction method, the depleted volume of the two landslides was estimated to be at least 820 +/- 20 x 10(6) m(3). Normal faulting in the region likely played a role in triggering the two landslides, because there are extensive geological and historical records of an active normal fault in this region. The subsequent geomorphological evolution of the two landslides is thus inferred to account for the observed morphological and tectonic features that are indicative of resulting in large and life-threatening landslides, as characterized using the recent remote sensing techniques.
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