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| Titel |
Autonomous detection of calving-related seismicity at Kronebreen, Svalbard |
| VerfasserIn |
A. Köhler, A. Chapuis, C. Nuth, J. Köhler, C. Weidle |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 6, no. 2 ; Nr. 6, no. 2 (2012-03-30), S.393-406 |
| Datensatznummer |
250003487
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| Publikation (Nr.) |
 copernicus.org/tc-6-393-2012.pdf |
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| Zusammenfassung |
| 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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