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A technique for conducting seismic refraction experiments on the ocean bed using bottom shots
Kirk, R.E.; Robertson, K.; Whitmarsh, R.B.; Miles, P.R. (1991). A technique for conducting seismic refraction experiments on the ocean bed using bottom shots. Mar. Geophys. Res. 13(2): 153-160
In: Marine Geophysical Researches. Reidel: Dordrecht. ISSN 0025-3235; e-ISSN 1573-0581, more
Peer reviewed article  

Available in  Authors 

Keywords
    Arrays > Seismic arrays
    Equipment > Geophysical equipment
    Methodology
    Ocean floor
    Seismic energy sources
    Marine/Coastal

Authors  Top 
  • Kirk, R.E.
  • Robertson, K.
  • Whitmarsh, R.B.
  • Miles, P.R.

Abstract
    A technique has been devised for firing arrays of bottom shots on the ocean bed in depths upto 4000 m or more. Ten kilogram explosive charges are dropped from the surface while the shooting ship is navigated acoustically. They are detonated at preset times by an electronic timer which initiates an electrical detonator, detonating cord and cast PETN/TNT explosive. Ranges to ocean bottom seismographs, and the shot instants, can be calculated from the arrival-time differences of the direct and surface-reflected water waves. The accuracy, which is dependent on water-depth and range, was better than 22 m in range and 14 msec in shot instant for our experiment.

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