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Volume 5 Number 4
  • E-ISSN: 1365-2478

Abstract

Abstract

A strong late arrival, with several cycles, has been observed in line refraction shooting, for distances ranging from 5000 to 30,000 feet. Using equations given by Officer (1953) it has been possible to establish that this event is a multiply reflected refraction. The conclusive factor was its very large amplitude which was about 60 times that expected for the simple head wave, at the distances involved. The wave‐guide was bounded by the surface of the earth and by the base of the Low Velocity layer, at a depth of about 80 feet.

An earlier paper (O'Brien, 1957a) gave a study of the head wave pulse refracted from this interface and the conclusions in the two papers are altogether compatible.

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2006-04-27
2024-04-16

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References

  1. Cagniard, L., 1939, Reflexion et Refraction des Ondes Seismiques Progressives, Gauthier‐Villars, Paris .
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  2. Newlands, Margery, 1952, The Disturbance due to a Line Source in a Semi‐Infinite Elastic Medium with a Single Surface Layer. Phil. Trans. Roy. Soc, Vol. 245, A. 896, 213–308.
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  3. O'Brien, P. N. S., 1957a, The Variation with Distance of the Amplitude of Critically Refracted Waves, Geophysical Prospecting, 5, 300–316.
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  4. O'Brien, P. N. S., 1957b, The Variation with Weight of Charge of the Amplitude of Refracted Waves, Letter to the Editor, Geophysical Prospecting, 5, 349–352.
    [Google Scholar]
  5. Officer, C. B., 1953, The Refraction Arrival in Water Covered Areas, Geophysics, 18, 805–820.
    [Google Scholar]
  6. Pekeris, C, 1948, Propagation of Sound in the Ocean, Memoir 27, Geological Soc. America .
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  • Article Type: Research Article

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