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Humming glaciers

David S. Heeszel, Fabian Walter and Deborah L. Kilb
Humming glaciers
Geology (Boulder) (October 2014) 42 (12): 1099-1102


Mountain glaciers represent one of the largest repositories of fresh water in alpine regions globally. However, little is known about the processes by which water moves through these systems. Analysis of data from a deployment of seismometers located near an ice marginal lake in the Swiss Alps reveals, for the first time, that harmonic tremor occurs within mountain glaciers and that individual icequakes at the glacier base can exhibit harmonic properties. These observations suggest that there is a complex network of fluid-induced fracture processes at the glacier base. Modeling changes in the observed harmonic frequencies indicates that the spectral characteristics of seismic data can provide important information about hydraulic fracture geometry and fluid pressure at depth, leading to important insights into subglacial hydrologic processes. Future modeling of these processes may lead to improved glacial outburst flood hazard predictions.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 42
Serial Issue: 12
Title: Humming glaciers
Affiliation: Scripps Institution of Oceanography, La Jolla, CA, United States
Pages: 1099-1102
Published: 20141024
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 34
Accession Number: 2014-102347
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
N45°58'00" - N45°58'00", E07°47'60" - E07°47'60"
Secondary Affiliation: Universite de Grenoble I, FRA, France
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201451
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