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  Regional passive seismic monitoring reveals dynamic glacier activity on Spitsbergen, Svalbard

Köhler, A., Nuth, C., Schweitzer, J., Weidle, C., Gibbons, S. J. (2015): Regional passive seismic monitoring reveals dynamic glacier activity on Spitsbergen, Svalbard. - Polar Research, 34, 1, 26178.
https://doi.org/10.3402/polar.v34.26178

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_1876903 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_1876903_5
Genre: Journal Article

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Köhler, Andreas1, Author
Nuth, Christopher1, Author
Schweitzer, Johannes1, Author
Weidle, Christian1, Author
Gibbons, Steven J.1, Author
Affiliations:
1Publikationen aller GIPP-unterstützten Projekte, Deutsches GeoForschungsZentrum, Potsdam, ou_44021              

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 Abstract: Dynamic glacier activity is increasingly observed through passive seismic monitoring. We analysed near-regional-scale seismicity on the Arctic archipelago of Svalbard to identify seismic icequake signals and to study their spatialÁ temporal distribution within the 14-year period from 2000 until 2013. This is the first study that uses seismic data recorded on permanent broadband stations to detect and locate icequakes in different regions of Spitsbergen, the main island of the archipelago. A temporary local seismic network and direct observations of glacier calving and surging were used to identify icequake sources. We observed a high number of icequakes with clear spectral peaks between 1 and 8 Hz in different parts of Spitsbergen. Spatial clusters of icequakes could be associated with individual grounded tidewater glaciers and exhibited clear seasonal variability each year with more signals observed during the melt season. Locations at the termini of glaciers, and correlation with visual calving observations in situ at Kronebreen, a glacier in the Kongsfjorden region, show that these icequakes were caused dominantly by calving. Indirect evidence for glacier surging through increased calving seismicity was found in 2003 at Tunabreen, a glacier in central Spitsbergen. Another type of icequake was observed in the area of the Nathorstbreen glacier system. Seismic events occurred upstream of the glacier within a short time period between January and May 2009 during the initial phase of a major glacier surge. This study is the first step towards the generation and implementation of an operational seismic monitoring strategy for glacier dynamics in Svalbard.

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Language(s): eng - English
 Dates: 2015
 Publication Status: Finally published
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.3402/polar.v34.26178
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Title: Polar Research
Source Genre: Journal, SCI, Scopus, p3, oa
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Pages: - Volume / Issue: 34 (1) Sequence Number: 26178 Start / End Page: - Identifier: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/160928