Seafloor borehole array seismic system (SEABASS)
Stephen, Ralph A.
Koelsch, Donald E.
Berteaux, Henri O.
Bolmer, S. Thompson
Goldsborough, Robert G.
Gould, Matthew R.
Kery, Sean M.
Peal, Kenneth R.
Swift, Stephen A.
Zani, A. Cleo
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KeywordVery 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)
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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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; Zimmerman, R.; Austin, G. (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; 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 ...