Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/8391
AuthorsWalter, F.* 
Olivieri, M.* 
Clinton, J.* 
TitleCalving
 event 
detection 
by
 observation 
of 
seiche 
effects 
on 
the
 Greenland 
fjords
Issue Date2013
Series/Report no./59 (2013)
DOI10.3189/2013JoG12J118
URIhttp://hdl.handle.net/2122/8391
Keywordsicequakes
calving icebergs
Greenland
Subject Classification02. Cryosphere::02.02. Glaciers::02.02.07. Ocean/ice interaction 
02. Cryosphere::02.02. Glaciers::02.02.10. Instruments and techniques 
04. Solid Earth::04.02. Exploration geophysics::04.02.06. Seismic methods 
04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring 
AbstractWith mass loss from the Greenland ice sheet accelerating and spreading to higher latitudes, the quantification of mass discharge in the form of icebergs has recently received much scientific attention. Here, we make use of very low frequency (0.001-0.01 Hz) seismic data from three permanent broadband stations installed in the summers of 2009/2010 in northwest Greenland in order to monitor local calving activity. At these frequencies, calving seismograms are dominated by a tilt signal produced by local ground flexure in response to fjord seiching generated by major iceberg calving events. A simple triggering algorithm is proposed to detect calving events from large calving fronts with potentially no user interaction. Our calving catalogue identifies spatial and temporal differences in calving activity between Jakobshavn Isbræ and glaciers in the Uummannaq district some 200 km further north. The Uummannaq glaciers show clear seasonal fluctuations in seiche-based calving detections as well as seiche amplitudes. In contrast, the detections at Jakobshavn Isbræ show little seasonal variation, which may be evidence for an ongoing transition into winter calving activity. The results offer further evidence that seismometers can provide efficient and inexpensive monitoring of calving fronts.
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