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Diurnal variations in vertical strain observed in a temperate valley glacier

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Title: Diurnal variations in vertical strain observed in a temperate valley glacier
Authors: Sugiyama, Shin1 Browse this author →KAKEN DB
Gudmundsson, G. Hilmar Browse this author
Authors(alt): 杉山, 慎1
Issue Date: 30-Jan-2003
Publisher: American Geophysical Union
Journal Title: Geophysical Research Letters
Volume: 30
Issue: 2
Publisher DOI: 10.1029/2002GL016160
Abstract: During a period of diurnal fluctuations in glacial flows speed, vertical strain was measured with sub-daily temporal resolution on Unteraargletscher, Switzerland. Mean vertical strain in boreholes up to 300-m deep out of 400-m-thick ice was found to fluctuate diurnally. Vertical strain rates were extensile in the daytime and compressive at night, with a magnitude of up to 10-3 day-1. Horizontal surface strain was observed to fluctuate in a manner consistent with the vertical deformation. Diurnal surface flow speed variations correlated well with basal water pressures suggesting a basal control on temporal flow variations. Nevertheless, the strain rate measurements indicated that changes in surface flow speed is affected by internal ice deformation and not a direct measure of local basal motion. Basal conditions in the surrounding neighborhood and their temporal variations take important role in short-term glacial flow fluctuations.
Description: An edited version of this paper was published by AGU. Copyright 2003, American Geophysical Union, Geophysical Research Letters, 30-2
Type: article (author version)
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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