Multiple Small Scale Landslides Triggered by Typhoon Talas 2011

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Authors

Ryo Okuwaki , Wenyuan Fan, Masumi Yamada, Hikaru Osawa, Tim J. Wright

Abstract

Devastating landslides can cause significant damage. In particular, typhoon-triggered landslides pose a chain of natural hazards. However, such events are difficult to detect due to their remote locations, leaving the physical processes poorly understood. Here we apply a novel surface-wave detector using intermediate-period surface waves to detect and locate landslides during the transit of Typhoon Talas 2011. We identify multiple landslides triggered by Typhoon Talas, including a landslide in the Tenryu Ward, Shizuoka, Japan, ~400 km east from the Typhoon’s track. The Tenryu landslide only displaced a total mass of 3.1×10^9 kg, which is much smaller than typical seismically-detectable landslides, yet generated coherent seismic signals propagating up to 3,000 km away. Our observations demonstrate that typhoons can potentially trigger landslides that are hundreds of kilometers away from their tracks. Our results also suggest an alerting technology to detect and locate landslides with only a sparse seismic network.

DOI

https://doi.org/10.31223/osf.io/3cxqz

Subjects

Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

Keywords

Inversion, Landslides, Seismology, Surface waves, Tropical cyclon, Typhoon

Dates

Published: 2020-08-16 19:49

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License

CC BY Attribution 4.0 International

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