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|a Motion of an Antarctic glacier by repeated tidally modulated earthquakes |h [electronic resource] |y English. |
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|a [S.l.] : |b Macmillan Publishers Limited, |c 2012. |
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|a Nature Geoscience Volume 5. |
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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 Between debris-laden glacial ice and bedrock, basal seismicity
can develop that yields information about bed properties1,2,
stress distribution3, outburst flooding4, and crevassing and
calving5–7. Basal seismicity in response to glacial motion
is linked to variations in both stress and lubrication of
bedrock by water and till8,9. Here we analyse data from
the Transantarctic Mountains Seismic Experiment array in
2002–2003 to investigate seismic behaviour at David Glacier,
a large outlet glacier that drains 4% of East Antarctica’s
ice sheet into the Ross Sea. We identify about 20,000
seismic events that are larger in magnitude and duration
than typical for glacial sources and repeat at regular intervals
of about 25 min. These events are consistent with stick–slip
behaviour of debris-laden ice moving over a single obstacle of
rough bedrock, modulated by relatively small stress changes
from the ocean tides. In the years before and after the
interval of repeating events, seismic events with irregular
and generally longer intervals were detected at the same
location, and are consistent with combined stick–slip and
continuous sliding of the subglacial interface. We suggest
that the observed transitions in seismicity patterns capture
the dynamic behaviour of the ice stream, and that—despite
lower ice-flow velocities—sliding in the stick–slip regime
enhances subglacial erosion. |
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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 Anandakrishnan, Sridhar. |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15062061/00001 |y Click here for full text |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/20/61/00001/FI15062061_thm.jpg |
