The Estimation of the Density, P-Wave, and S-Wave Speeds of the Top-Most Layer of Sediments, from Water Bottom Reflection Arrivals

  • R. Chapman
  • S. Levy
  • J. Cabrera
  • K. Stinson
  • D. Oldenburg
Part of the NATO Conference Series book series (NATOCS, volume 16)

Abstract

Procedures for estimating material properties of the sea floor sediments are presented. The estimation procedures make use of the relationship between amplitude and offset for pre-critical reflections, and the relationship between phase shift and offset for post-critical reflections. In all cases we assume that the source, hydrophone, and ocean depths are given, and that the measured bottom reflection is adequately modelled as a plane wave response. We consider three cases: the sea floor sediments are approximated as a liquid layer, and the relation between reflection strength and source-receiver offset for a set of pre-critical reflections is analysed; the sea floor sediments are approximated as a liquid layer, and the relation between phase shift and source-receiver offset for a set of post-critical reflections is studied; the sediments layer is assumed to be elastic, and the relation between reflection strength and source-receiver offset for a set of pre-critical reflections is analysed.

Keywords

Attenuation Explosive Refraction Hydrophone 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Arons, A.B., Yennie, D.R., 1950, Phase distortion of acoustic pulses obliquely reflected from a medium of higher sound velocity: J. Acoust. Soc. Amer. v. 22, 231–237.CrossRefGoogle Scholar
  2. Brekhovskikh, L.M., 1960, Waves in Layered Media. New York: Academic Press.Google Scholar
  3. Carrion, P., Kuo, J.T., Stoffa, P., 1984, Inversion method in the slant stack domain using amplitudes of reflection arrrivals: Geophys. Prosp. v. 32, 375–391.CrossRefGoogle Scholar
  4. Chapman, N.R., Levy, S., Stinson, K., Jones, I., Prager, B., Oldenburg, D., 1985, Inversion of sound speed and density profiles in deep ocean sediments: submitted to J. Acoust. Soc. Amer.Google Scholar
  5. Fuchs, K., Muller, G., 1971, Computation of synthetic seismograms with the reflectivity method and comparison of observations: Geophys. Journal of the R.A.S. v. 23, 417–433.Google Scholar
  6. Rayleigh, L., 1945, The Theory of Sound. New York: Dover Publication.Google Scholar

Copyright information

© Plenum Press, New York 1986

Authors and Affiliations

  • R. Chapman
    • 1
  • S. Levy
    • 2
  • J. Cabrera
    • 2
  • K. Stinson
    • 2
  • D. Oldenburg
    • 2
  1. 1.Defence Research Establishment PacificFMO VictoriaCanada
  2. 2.IT&A Inverse Theory & Applications IncVancouverCanada

Personalised recommendations