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The Cryosphere An interactive open-access journal of the European Geosciences Union
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Volume 6, issue 2
The Cryosphere, 6, 393–406, 2012
https://doi.org/10.5194/tc-6-393-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
The Cryosphere, 6, 393–406, 2012
https://doi.org/10.5194/tc-6-393-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 30 Mar 2012

Research article | 30 Mar 2012

Autonomous detection of calving-related seismicity at Kronebreen, Svalbard

A. Köhler1, A. Chapuis2, C. Nuth1, J. Kohler3, and C. Weidle4 A. Köhler et al.
  • 1Department of Geosciences, University of Oslo, Norway
  • 2Department of Mathematical Sciences and Technology, Norwegian University of Life Sciences, Norway
  • 3Norwegian Polar Institute, Tromsø, Norway
  • 4Department of Geosciences, Christian-Albrechts-Universität zu Kiel, Germany

Abstract. We detect and cluster waveforms of seismic signals recorded close to the calving front of Kronebreen, Svalbard, to identify glacier-related seismic events and to investigate their relation to calving processes. Single-channel geophone data recorded over several months in 2009 and 2010 are combined with eleven days of direct visual observations of the glacier front. We apply a processing scheme which combines conventional seismic event detection using a sensitive trigger algorithm and unsupervised clustering of all detected signals based on their waveform characteristics by means of Self-Organizing Maps (SOMs). About 10% of the directly observed calving events close to the geophone (<1 km) can be correlated with seismic detections. We are able to distinguish between false detections, instrumental artifacts, and three classes of signals which are, with different degrees of uncertainty, emitted by calving or glacier activity in general. By extrapolating the interpretation of seismic event classes beyond the time period of visual observations, the temporal distribution of glacier-related events shows an increase in event rate in autumn, particularly for the class which is related to iceberg calving. Using the seismic event distribution in this class as a proxy for the calving rate and measurements of glacier velocity and glacier front position, we discuss the possible relationship between glacier dynamics and calving processes at Kronebreen.

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