Item: Avalanches on Mt. Fuji, Japan: Seismic detection and tracking combined with numerical simulations
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Title: Avalanches on Mt. Fuji, Japan: Seismic detection and tracking combined with numerical simulations
Proceedings: International Snow Science Workshop Proceedings 2018, Innsbruck, Austria
Authors:
- Pérez-Guillén Cristina [ Graduate School of Environmental Studies, Nagoya University, Japan ] [ RISKNAT Avalanche Research Group, University of Barcelona, Spain ]
- Tsunematsu Kae [ Mount Fuji Research Institute, Yamanashi Prefectural Government, Japan ] [ Dept. of Earth and Environmental Sciences, Yamagata University, Yamagata, Japan ]
- Nishimura Kouichi [ Graduate School of Environmental Studies, Nagoya University, Japan ]
- Issler Dieter [ Norwegian Geotechnical Institute, Oslo, Norway ]
Date: 2018-10-07
Abstract: Avalanches from Mt. Fuji may attain run-out distances of up to 3km and represent a major natural hazard. These avalanches exhibit different flow types from typical dry-snow avalanches in winter to slush flows triggered by heavy rain in spring. For monitoring the volcanic activity of Mt. Fuji, a dense permanent seismic network is installed around the volcano. The seismic recordings are used here to identify avalanche events and locate them in time and space. Applying the amplitude source location (ASL) method for the first time to avalanches, several avalanche events have been seismically identified in each of three analyzed avalanche periods in the winters of 2014, 2016 and 2018. The largest avalanches (size class 4-5) are detected by the seismic sensors at distances up to 15 km, medium-size events within a radius of 9 km. The joint analysis of several seismic stations allowed localizing and tracking these avalanches so that the run-out distances and velocities could be estimated. The accuracy of the seismic tracking was analyzed by simulating the avalanches with the dynamical model Titan2D, using aerial photos and meteorological records to estimate the release areas and volumes.
Object ID: ISSW2018_O01.3.pdf
Language of Article: English
Presenter(s):
Keywords: Snow avalanches, seismic detection, avalanche location, numerical simulations.
Page Number(s): 11-15
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