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2003, and B15A in October 2005) broke up or fractured while exiting the Ross Sea in a narrowly defined area off Cape Adare, Antarctica. Examination of recent swath‐mapped bathymetric observations revealed that the principle agent of these breakups is a previously unknown 9 km long ridge with minimum...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.467.8836 2023-05-15T13:31:21+02:00 Here for Full Article The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.467.8836 http://www.earth.northwestern.edu/people/emile/PDF/EAO206.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.467.8836 http://www.earth.northwestern.edu/people/emile/PDF/EAO206.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.earth.northwestern.edu/people/emile/PDF/EAO206.pdf text ftciteseerx 2016-01-08T07:02:37Z 2003, and B15A in October 2005) broke up or fractured while exiting the Ross Sea in a narrowly defined area off Cape Adare, Antarctica. Examination of recent swath‐mapped bathymetric observations revealed that the principle agent of these breakups is a previously unknown 9 km long ridge with minimum depths of 215 m that we call Davey Shoal. Satellite imagery shows that the icebergs are driven into the shoal by coastal currents that converge over the narrow continental shelf. One of the icebergs, the 120 km by 30 km B15A, was instrumented with a seismograph, GPS, and fluxgate compass. This instrumentation provided a unique opportunity to establish the details of the iceberg kinematics that were not revealed by satellite imagery alone and to correlate seismic events observed both on the iceberg and in the far field during breakup. B15A fractured from multiple strikes against Davey Shoal and the adjacent Possession Islands; these strikes were driven by the combination of tidal currents and the coastal mean flow. The periods of iceberg‐sourced seismic radiation were correlated with the strikes. The iceberg ‐ and land‐based seismic signals showed that the iceberg fracture, its sliding across the shoals, and the ice‐on‐ice stick‐slip contacts among the postbreakup iceberg fragments generated the strong chaotic and harmonic tremor episodes that were observed at distances as far as the South Pole, where these signals propagated as seismically coupled hydroacoustic T phases. Text Antarc* Antarctica Possession Islands Ross Sea South pole South pole Unknown Adare ENVELOPE(170.233,170.233,-71.283,-71.283) Cape Adare ENVELOPE(175.000,175.000,-71.000,-71.000) Davey ENVELOPE(-58.567,-58.567,-61.967,-61.967) Long Ridge ENVELOPE(73.583,73.583,-53.100,-53.100) Possession Islands ENVELOPE(171.167,171.167,-71.933,-71.933) Ross Sea South Pole The Shoals ENVELOPE(-56.498,-56.498,49.817,49.817) |
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2003, and B15A in October 2005) broke up or fractured while exiting the Ross Sea in a narrowly defined area off Cape Adare, Antarctica. Examination of recent swath‐mapped bathymetric observations revealed that the principle agent of these breakups is a previously unknown 9 km long ridge with minimum depths of 215 m that we call Davey Shoal. Satellite imagery shows that the icebergs are driven into the shoal by coastal currents that converge over the narrow continental shelf. One of the icebergs, the 120 km by 30 km B15A, was instrumented with a seismograph, GPS, and fluxgate compass. This instrumentation provided a unique opportunity to establish the details of the iceberg kinematics that were not revealed by satellite imagery alone and to correlate seismic events observed both on the iceberg and in the far field during breakup. B15A fractured from multiple strikes against Davey Shoal and the adjacent Possession Islands; these strikes were driven by the combination of tidal currents and the coastal mean flow. The periods of iceberg‐sourced seismic radiation were correlated with the strikes. The iceberg ‐ and land‐based seismic signals showed that the iceberg fracture, its sliding across the shoals, and the ice‐on‐ice stick‐slip contacts among the postbreakup iceberg fragments generated the strong chaotic and harmonic tremor episodes that were observed at distances as far as the South Pole, where these signals propagated as seismically coupled hydroacoustic T phases. |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.467.8836 http://www.earth.northwestern.edu/people/emile/PDF/EAO206.pdf |
long_lat |
ENVELOPE(170.233,170.233,-71.283,-71.283) ENVELOPE(175.000,175.000,-71.000,-71.000) ENVELOPE(-58.567,-58.567,-61.967,-61.967) ENVELOPE(73.583,73.583,-53.100,-53.100) ENVELOPE(171.167,171.167,-71.933,-71.933) ENVELOPE(-56.498,-56.498,49.817,49.817) |
geographic |
Adare Cape Adare Davey Long Ridge Possession Islands Ross Sea South Pole The Shoals |
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Adare Cape Adare Davey Long Ridge Possession Islands Ross Sea South Pole The Shoals |
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Antarc* Antarctica Possession Islands Ross Sea South pole South pole |
genre_facet |
Antarc* Antarctica Possession Islands Ross Sea South pole South pole |
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http://www.earth.northwestern.edu/people/emile/PDF/EAO206.pdf |
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http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.467.8836 http://www.earth.northwestern.edu/people/emile/PDF/EAO206.pdf |
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