Pressure fluctuations caused by a strong ocean floor current are evident during most of an eighty-day-long record of very-low-frequency acoustic ambient noise measured by an instrument on the seafloor in the western Atlantic in the framework of the HEBBLE (High Energy Benthic Boundary Layer Experiment). The differential pressure gauges on the instrument produce useful measurements over a wide frequency band extending from 0.0005 to 16 Hz. The spectrum of current-induced pressure fluctuations is red with a power-law dependence on frequency with an exponent of -1.5. Turbulence in the ocean floor boundary layer is the source of these pressure fluctuations rather than the effects of flow around the transducers. This record of boundary-layer pressure fluctuations is used to predict the effect of seafloor currents on long-period seismograph measurements from the seafloor and from under the seafloor in boreholes.


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    Title :

    Long-period acoustic and seismic measurements and ocean floor currents


    Additional title:

    Langzeitige akustische und seismische Messungen und Meeresbodenstroemungen


    Contributors:
    Webb, S.C. (author)

    Published in:

    Publication date :

    1988


    Size :

    8 Seiten, 36 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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