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    Seafloor borehole array seismic system (SEABASS)

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    WHOI-01-93.pdf (3.801Mb)
    Date
    1993-01
    Author
    Stephen, Ralph A.  Concept link
    Koelsch, Donald E.  Concept link
    Berteaux, Henri O.  Concept link
    Bocconcelli, Alessandro  Concept link
    Bolmer, S. Thompson  Concept link
    Cretin, J.  Concept link
    Etourmy, N.  Concept link
    Fabre, A.  Concept link
    Goldsborough, Robert G.  Concept link
    Gould, Matthew R.  Concept link
    Kery, Sean M.  Concept link
    Laurent, J.  Concept link
    Omnes, G.  Concept link
    Peal, Kenneth R.  Concept link
    Swift, Stephen A.  Concept link
    Turpening, R.  Concept link
    Zani, A. Cleo  Concept link
    Metadata
    Show full item record
    Citable URI
    https://hdl.handle.net/1912/8071
    DOI
    10.1575/1912/8071
    Keyword
     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.
    Collections
    • Geology and Geophysics (G&G)
    • WHOI Technical Memoranda
    Suggested Citation
    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/1912/8071
     

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