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SUMMARY:Kinematic and seismic analysis of the breakup of the giant iceberg
  B15A at Cape Adare\, Antarctica - Prof Seelye Martin (University of Washi
 ngton)
DTSTART:20100720T140000Z
DTEND:20100720T150000Z
UID:TALK25617@talks.cam.ac.uk
CONTACT:19377
DESCRIPTION:Satellite imagery reveals that the large iceberg B15A\, measur
 ing 120 km by 30 km\, broke up while exiting the Ross Sea in October 2005.
  Bathymetric observations revealed that the principal agent of these break
 ups is a previously unknown 9 km long shoal with minimum depths of 215 m. 
 Satellite imagery shows that B15A and other icebergs are driven into the s
 hoal by coastal currents that converge over the narrow continental shelf. 
 Because B15A was instrumented with a seismograph\, GPS\, and fluxgate comp
 ass\, this provided a unique opportunity to establish the details of the i
 ceberg kinematics that were not revealed by satellite imagery alone and to
  correlate seismic events observed both on the iceberg and in the far fiel
 d during breakup. B15A fractured from multiple strikes against Davey Shoal
  and the adjacent Possession Islands\; these strikes were driven by the co
 mbination of tidal currents and the coastal mean flow. The periods of iceb
 erg‐sourced seismic radiation were correlated with the strikes. The iceb
 erg‐ and land‐based seismic signals showed that the iceberg fracture\,
  its sliding across the shoals\, and the ice‐on‐ice stick‐slip conta
 cts among the postbreakup iceberg fragments generated the strong chaotic a
 nd harmonic tremor episodes\, some of which were observed at distances as 
 far as the South Pole\, where these signals propagated as seismically coup
 led hydroacoustic T phases.
LOCATION:DAMTP\, room MR4
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