Long-range detection of hydroacoustic signals from large icebergs in the Ross Sea, Antarctica

Jacques Talandier; Olivier Hyvernaud; Emile A. Okal; Pierre Franck Piserchia

doi:10.1016/S0012-821X(02)00867-1

Long-range detection of hydroacoustic signals from large icebergs in the Ross Sea, Antarctica

Jacques Talandier, Olivier Hyvernaud, Emile A. Okal, Pierre Franck Piserchia

Earth, Environmental, and Planetary Sciences

Research output: Contribution to journal › Article › peer-review

44 Scopus citations

Abstract

Hydroacoustic signals detected in late 2000 by seismic stations in Polynesia are shown to originate from huge icebergs which at the time were drifting in the Ross Sea after calving off the Ross Ice Shelf. The signals present a broad variety of spectral characteristics, most of them featuring prominent eigenfrequencies in the 4-7 Hz range, often complemented by overtones. Most epicenters, obtained by combining observations of distant hydroacoustic and regional seismic records, follow the spatio temporal evolution of the drift of iceberg B-15B. Most of the signals are generated during a 36-day time window when it is speculated that B-15B collided with smaller icebergs or was scraping the ocean floor on the shallow continental shelf. We speculate on the possible physical nature of the resonator generating the signals, which could correspond to an elastic mode of the iceberg, or to the oscillation of fluid-filled cracks in the ice.

Original language	English (US)
Pages (from-to)	519-534
Number of pages	16
Journal	Earth and Planetary Science Letters
Volume	203
Issue number	1
DOIs	https://doi.org/10.1016/S0012-821X(02)00867-1
State	Published - Oct 15 2002

Funding

We thank Rick Aster for providing the Erebus network data, Bernard Chouet, Michel Bouchon and Michel Vallon for discussion, and Jackie Caplan-Aucherbach and another reviewer for helpful comments. Matthew Lazzara kindly provided a customized version of Fig. 7 . Maps were drawn using the GMT software of Wessel and Smith [38] . This research was supported at Northwestern University by the Department of Defense under Contract DTRA01-C-0065.

Keywords

Acoustical methods
Icebergs
Seismic waves

ASJC Scopus subject areas

Geophysics
Geochemistry and Petrology
Earth and Planetary Sciences (miscellaneous)
Space and Planetary Science

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10.1016/S0012-821X(02)00867-1

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title = "Long-range detection of hydroacoustic signals from large icebergs in the Ross Sea, Antarctica",

abstract = "Hydroacoustic signals detected in late 2000 by seismic stations in Polynesia are shown to originate from huge icebergs which at the time were drifting in the Ross Sea after calving off the Ross Ice Shelf. The signals present a broad variety of spectral characteristics, most of them featuring prominent eigenfrequencies in the 4-7 Hz range, often complemented by overtones. Most epicenters, obtained by combining observations of distant hydroacoustic and regional seismic records, follow the spatio temporal evolution of the drift of iceberg B-15B. Most of the signals are generated during a 36-day time window when it is speculated that B-15B collided with smaller icebergs or was scraping the ocean floor on the shallow continental shelf. We speculate on the possible physical nature of the resonator generating the signals, which could correspond to an elastic mode of the iceberg, or to the oscillation of fluid-filled cracks in the ice.",

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author = "Jacques Talandier and Olivier Hyvernaud and Okal, {Emile A.} and Piserchia, {Pierre Franck}",

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AU - Okal, Emile A.

AU - Piserchia, Pierre Franck

N1 - Funding Information: We thank Rick Aster for providing the Erebus network data, Bernard Chouet, Michel Bouchon and Michel Vallon for discussion, and Jackie Caplan-Aucherbach and another reviewer for helpful comments. Matthew Lazzara kindly provided a customized version of Fig. 7 . Maps were drawn using the GMT software of Wessel and Smith [38] . This research was supported at Northwestern University by the Department of Defense under Contract DTRA01-C-0065.

PY - 2002/10/15

Y1 - 2002/10/15

N2 - Hydroacoustic signals detected in late 2000 by seismic stations in Polynesia are shown to originate from huge icebergs which at the time were drifting in the Ross Sea after calving off the Ross Ice Shelf. The signals present a broad variety of spectral characteristics, most of them featuring prominent eigenfrequencies in the 4-7 Hz range, often complemented by overtones. Most epicenters, obtained by combining observations of distant hydroacoustic and regional seismic records, follow the spatio temporal evolution of the drift of iceberg B-15B. Most of the signals are generated during a 36-day time window when it is speculated that B-15B collided with smaller icebergs or was scraping the ocean floor on the shallow continental shelf. We speculate on the possible physical nature of the resonator generating the signals, which could correspond to an elastic mode of the iceberg, or to the oscillation of fluid-filled cracks in the ice.

AB - Hydroacoustic signals detected in late 2000 by seismic stations in Polynesia are shown to originate from huge icebergs which at the time were drifting in the Ross Sea after calving off the Ross Ice Shelf. The signals present a broad variety of spectral characteristics, most of them featuring prominent eigenfrequencies in the 4-7 Hz range, often complemented by overtones. Most epicenters, obtained by combining observations of distant hydroacoustic and regional seismic records, follow the spatio temporal evolution of the drift of iceberg B-15B. Most of the signals are generated during a 36-day time window when it is speculated that B-15B collided with smaller icebergs or was scraping the ocean floor on the shallow continental shelf. We speculate on the possible physical nature of the resonator generating the signals, which could correspond to an elastic mode of the iceberg, or to the oscillation of fluid-filled cracks in the ice.

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KW - Seismic waves

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Long-range detection of hydroacoustic signals from large icebergs in the Ross Sea, Antarctica

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Keywords

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