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Volume 37 Number 1
  • E-ISSN: 1365-2478

Abstract

A

A borehole sparker seismic source enclosed in a semi‐flexible tube has been developed to produce a short compressional seismic pulse with a frequency content in the range 250 Hz to 3.5 kHz with a peak power at 570 Hz. The pulse shape and frequency content are shown to be a function of the input power, the diameter of the spark chamber, the salinity of the electrolyte, the material of the spark chamber and the electrode configuration. When in a borehole, the source produces a vertically polarized shear wave but, being similar to a small explosive charge does not allow phase reversal as a means of identifying the shear wave in the received pulse train. The source is shown to be ideal for tomographic imaging surveys because of its repetitive nature, high frequency content and reliability. Very high resolution seismic reflection surveys are also shown to be possible under favourable circumstances.

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2006-04-27
2024-04-23

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References

  1. Bobber, R.J.1970. Underwater electroacoustic measurements. Naval Research Laboratory, Washington D.C. , U.S.A .
    [Google Scholar]
  2. Grainger, P. and McCann, D.M.1977. Interborehole acoustic measurements in site investigation. Quarterly Journal of Engineering Geology10, 241–255.
    [Google Scholar]
  3. Hall, J., Miller, F. and Simmonds, G.1979. A technique for the precise measurement of acoustic velocity in, and between, boreholes with a sparker source. Geoexploration17, No. 3.
    [Google Scholar]
  4. Kramer, F.S., Peterson, R.A. and Walter, W.C.1968. Seismic Energy Source Handbook. Bendix United Geophysical Corporation.
    [Google Scholar]
  5. McCann, D.M., Baria, R., Jackson, P.D. and Green, A.S.P.1986. Application of cross‐hole seismic measurements in site investigation surveys. Geophysics51, 914–925.
    [Google Scholar]
  6. McCann, D.M., Grainger, P. and McCann, C.1975. Inter‐borehole acoustic methods and their use in engineering geology. Geophysical Prospecting23, 49–65.
    [Google Scholar]
  7. Roi, N.A. and Frolov, D.P.1961. The electroacoustic efficiency of a spark discharge in water. RAF Farnborough Library, Translation No. 795.
    [Google Scholar]
  8. White, J.G. and Sengbush, R.L.1963. Shear waves from explosive sources. Geophysics28, 1001–1019.
    [Google Scholar]
  9. Worthington, M.H.1984. An introduction to geophysical tomography. First Break, 2, (11), 20–26.
    [Google Scholar]
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  • Article Type: Research Article

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