The propagation loss from a shallow underwater explosion to a buried vertically polarized seismometer over the frequency band between 3 and 15 Hz was measured during the 1983 Ngendei Experiment. The data was recorded in 5.5-km-deep water in the southwest Pacific with a triaxial borehole seismograph emplaced 50 m within the basaltic basement. It is found that the average power decays as r-3 (r is slant range) beyond 30 km and that the propagation loss is minimal between 6-9 Hz. At shorter ranges, the propagation loss is more complicated and exhibits a stronger frequency dependence. Power in the first water wave is estimated for both buried and ocean-bottom sensors. The ocean-bottom power is approximately 7 dB higher than that recorded by the buried sensor, and both exhibit similar decay rates.


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    Title :

    VLF propagation loss to a buried seismometer


    Additional title:

    Verluste bei der Ausbreitung von VLF-Schallwellen zu einem versenkten Seismographen


    Contributors:
    Sereno, T.J. (author) / Farrell, W.E. (author) / Orcutt, J.A. (author) / Adair, R.G. (author)

    Published in:

    Publication date :

    1988


    Size :

    9 Seiten, 17 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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