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|a Spatial and temporal variations in Greenland glacial-earthquake activity, 1993-2010 |h [electronic resource]. |
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|a [S.l.] : |b American Geophysical Union, |c 2012-08-27. |
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|a Journal of Geophysical Research. |
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|a Please contact the owning institution for licensing and permissions. It is the user's responsibility to ensure use does not violate any third party rights. |
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|a Glacial earthquakes are anomalous earthquakes associated with
large ice-loss events occurring at marine-terminating glaciers, primarily in
Greenland. They are detectable teleseismically, and a proper understanding
of the source mechanism may provide a remote-sensing tool to complement
glaciological observations of these large outlet glaciers. We model teleseismic
surface-wave waveforms to obtain locations and centroid–single-force source
parameters for 121 glacial earthquakes occurring in Greenland during the
period 2006–2010. We combine these results with those obtained by previous
workers [Tsai and Ekstr¨om, 2007] to analyze spatial and temporal trends
in glacial-earthquake occurrence over the 18-year period from 1993–2010. We
also examine earthquake occurrence at six individual glaciers, comparing the
earthquake record to independently obtained observations of glacier change.
Our findings confirm the inference that glacial-earthquake seismogenesis occurs
through the capsize of large, newly calved icebergs. We find a close correspondence
between episodes of glacier retreat, thinning, and acceleration
and the timing of glacial earthquakes, and document the northward progression
of glacial earthquakes on Greenland’s west coast over the 18-year observing
period. Our results also show that glacial earthquakes occur when
the termini of the source glaciers are very close to the glacier grounding line,
i.e., when the glaciers are grounded or nearly grounded. |
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|a Electronic reproduction. |c Florida International University, |d 2015. |f (dpSobek) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software. |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15062073/00001 |y Click here for full text |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/20/73/00001/FI15062073_thm.jpg |
