Journal
GEOPHYSICAL JOURNAL INTERNATIONAL
Volume 201, Issue 1, Pages 372-376Publisher
OXFORD UNIV PRESS
DOI: 10.1093/gji/ggv026
Keywords
Numerical approximations and analysis; Tsunamis; Fracture and flow; North America
Categories
Funding
- China Geological Survey [1212011220173]
- National Natural Science Foundation of China [41202247, 41302230]
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On December 4, 2007, a three million cubic metres landslide impacted Chehalis Lake, 80 km east of Vancouver, Canada. The failed mass rushed into the lake and parented a tsunami that ran up 38 m on the opposite shore, destroyed trees, roads and campsite facilities. Armed with field surveys and multihigh-tech observations from SONAR, LiDAR and orthophotographs, we apply the newly developed 'Tsunami Squares' method to simulate the Chehalis Lake landslide and its generated tsunami. The landslide simulation shows a progressive failure, flow speeds up to similar to 60 m s(-1), and a slide mass stoppage with uniform repose angle on the lakebed. Tsunami products suggest that landslide velocity and spatial scale influence the initial wave size, while wave energy decay and inundation heights are affected by a combination of distance to the landslide, bathymetry and shoreline orientation relative to the wave direction.
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