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Observation of surface seismic activity changes of an Alpine glacier during a glacier-dammed lake outburst

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Title: Observation of surface seismic activity changes of an Alpine glacier during a glacier-dammed lake outburst
Authors: Roux, P.-F. Browse this author
Walter, F. Browse this author
Riesen, P. Browse this author
Sugiyama, S. Browse this author →KAKEN DB
Funk, M. Browse this author
Issue Date: 31-Jul-2010
Publisher: American Geophysical Union
Journal Title: Journal of Geophysical Research, Earth Surface
Volume: 115
Start Page: F03014
Publisher DOI: 10.1029/2009JF001535
Abstract: During the 2004 outburst flood of Gornersee, Switzerland, we observed surface microseismic activity (so-called icequakes) near the glacier-dammed lake on Gornergletscher. Using surface waves, we located near-surface tensile fracturing events by inverting time delays using a quasi-Newton scheme. We located 8520 near-surface events with uncertainties of less than 10 m. Seismic activity increased during the lake drainage, and the icequake epicenters migrated downglacier. Furthermore, we identified events whose fault plane orientations are nearly perpendicular to the local pattern of surface crevassing. These observations can be explained by the rotation of principal strains at the glacier surface deduced from local ice flow measurement which occurred during the flotation of the ice dam at the onset of the lake drainage. In general, we suggest that our technique is a useful tool to locate large data sets of microseismic events and can be used to monitor the temporal evolution of fracture processes and their dependence on glacier flow and glacier hydrology.
Rights: Copyright 2010 by the American Geophysical Union.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 杉山 慎

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