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- W2625406854 abstract "Tsunami generated by submarine landslides are now recognised as an important hazard, followingseveral historical events. Submarine landslides can occur in a variety of settings such as oncontinental slopes, volcanic slopes, and submerged canyons and fjords. While significant progress hasbeen made in understanding tsunami generation processes on open slopes, the problem of tsunamigeneration by landslides within submarine canyons has received less attention. In this paper weexamine the tsunami hazard posed by submarine landslides in the Cook Strait canyon system, nearWellington, New Zealand. Understanding of the hazard posed by this tsunami source has practicalvalue because of its proximity to a populated coast. Our studies also provide general resultshighlighting the differences between tsunami generation on open coasts and tsunami generationwithin canyons. Geotechnical and geological studies of the Cook Strait region reveal evidence formany large landslide scars in the canyon walls, these are interpreted to be failures of consolidatedmaterial which descend the slopes on the sides of the canyon. Scouring of the base of the canyonslopes by strong tidal currents is believed to be an important process in bringing slopes to the point offailure, with most large failures expected to occur during earthquake shaking. We present the resultsof computer simulations of landslide failures using simplified canyon geometries represented in either2D (vertical slice) or 3D. These simulations were made using Gerris, an adaptive-grid fluid dynamicssolver. A key finding is that the sudden deceleration of the landslide material after reaching thecanyon floor, leads to larger amplitude waves in the back-propagation direction (i.e. in the oppositedirection to the initial landslide motion)." @default.
- W2625406854 created "2017-06-23" @default.
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- W2625406854 date "2016-11-01" @default.
- W2625406854 modified "2023-09-26" @default.
- W2625406854 title "Assessing landslide-tsunami hazard in submarine canyons, using the Cook strait canyon system as an example" @default.
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