Seafloor borehole array seismic system (SEABASS)

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1993-01Author
Stephen, Ralph A.
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Koelsch, Donald E.
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Berteaux, Henri O.
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Bocconcelli, Alessandro
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Bolmer, S. Thompson
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Cretin, J.
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Etourmy, N.
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Fabre, A.
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Goldsborough, Robert G.
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Gould, Matthew R.
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Kery, Sean M.
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Laurent, J.
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Omnes, G.
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Peal, Kenneth R.
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Swift, Stephen A.
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Turpening, R.
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Zani, A. Cleo
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https://hdl.handle.net/1912/8071DOI
10.1575/1912/8071Keyword
Very Low Frequency (VLF) sound fields (2-50 Hz); Seafloor Borehole Array Seismic System (SEABASS); Deep Sea Drilling Project (DSDP).; Low Frequency Acoustic-Seismic Experiment (LFASE)Abstract
The Seafloor Borehole Array Seismic System (SEABASS) has been developed to
measure the pressure and three dimensional particle velocity of the VLF sound field (2-50HZ)
below the seafloor in the deep ocean (water depths of up to 6km). The system consists off our
three-component borehole seismometers (with an optional hydrophone), a borehole digitizing
unit, and a seafloor control and recording package. The system can be deployed using a wire line
re-entry capability from a conventional research vessel in Deep Sea Drilling Project (DSDP)
and Ocean Drilling Project (ODP) boreholes. Data from below the seafloor are acquired either
on-board the research vessel via coaxial tether or remotely on the seafloor in a self-contained
package. If necessary the data module from the seafloor package can be released independently
and recovered on the surface. This paper describes the engineering specifications of SEABASS,
the tests that were carried out, and preliminary results from an actual deep sea deployment.
Ambient noise levels beneath the seafloor acquired on the Low Frequency Acoustic-Seismic
Experiment (LFASE) are within 20dB of levels from previous seafloor borehole seismic
experiments and from land borehole measurements. The ambient noise observed on LFASE
decreases by up to 12dB in the upper 100m of the seafloor in a sedimentary environment.
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Working Paper: Stephen, Ralph A., Koelsch, Donald E., Berteaux, Henri O., Bocconcelli, Alessandro, Bolmer, S. Thompson, Cretin, J., Etourmy, N., Fabre, A., Goldsborough, Robert G., Gould, Matthew R., Kery, Sean M., Laurent, J., Omnes, G., Peal, Kenneth R., Swift, Stephen A., Turpening, R., Zani, A. Cleo, "Seafloor borehole array seismic system (SEABASS)", 1993-01, DOI:10.1575/1912/8071, https://hdl.handle.net/1912/8071Related items
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Progress report on the development of the seafloor borehole array seismic system (phase II) : July 14, 1992 to January 31, 1996
Stephen, Ralph A.; Peal, Kenneth R.; Bolmer, S. Thompson; Gould, Matthew R.; Koelsch, Donald E.; Orcutt, John A.; Vernon, Frank L.; Offield, G.; Willoughby, David F.; Hollinshead, C. B.; Spiess, Fred N.; Hildebrand, John A.; Zimmerman, Richard; Austin, Gary (Woods Hole Oceanographic Institution, 1996-06)The Seafloor Borehole Array Seismic System (SEABASS) was originally developed to record autonomously on the seafloor the signals received on a four-sonde three-component borehole geophone array in the VLF band (2-50Hz)(Stephen ... -
Broadband borehole seismic system integration tests : report of the system integration tests at MPL/SIO
Goldsborough, Robert G.; Austin, Gary; Bolmer, S. Thompson; Jabson, David M.; Jonke, Patrick; Gould, Matthew R.; Hildebrand, John A.; Hollinshead, C. B.; Offield, Glen; Orcutt, John; Peal, Kenneth R.; Spiess, Fred N.; Stephen, Ralph A.; Vernon, Frank L.; Willoughby, David F.; Zimmerman, Richard (Woods Hole Oceanographic Institution, 1998)This report describes a series of tests performed at SIO/MPL, Point Lorna the week of 17 November 1997 designed to achieve integration of the Broadband Borehole Seismic System (BBBSS) in preparation for the OSN Pilot ... -
Tests of the broadband borehole seismic system (B³S²) at Scripps IGPP and the Pinon Flat Observatory : October 1994 to June 1995
Stephen, Ralph A.; Orcutt, John; Peal, Kenneth R.; Vernon, Frank L.; Austin, Gary; Bolmer, S. Thompson; Gould, Matthew R.; Koelsch, Donald E.; Hollinshead, C. B.; Offield, Glen; Willoughby, David F. (Woods Hole Oceanographic Institution, 1997-08)The broadband borehole seismic system (B3S2) is being developed as one component of the Ocean Seismic Network (OSN) Pilot Experiment which will be carried out at the OSN-1 Site off Hawaii in Winter 1998. The other major ...