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Model Computations for Low-Velocity Surface Waves on Marine Sediments

  • Heinz-H. Essen
Part of the NATO Conference Series book series (NATOCS, volume 5)

Abstract

In seismology Rayleigh waves, which propagate along the free surface, are of great importance for determining the elastic parameters of the upper mantle. With regard to shear-wave velocities in the upper layers of ocean sediments the same may apply to Scholte waves, which propagate along the interface between ocean and sea floor. In the case of homogeneous halfspaces both, Rayleigh and Scholte waves are nondispersive, however the dependences of propagation velocities on the elastic parameters are different. But in presence of layers the Rayleigh as well as the Scholte wave splits up into a finite number of dispersive modes. As for Rayleigh waves this effect seems to be of importance for Scholte waves, too. Measurements of Schirmer et al. from the shore belt of the North Sea show two different dispersive modes. In this paper simple theoretical models are presented in order to investigate the dispersion of “Rayleigh” — and “Scholte”-modes on ocean sea-floors. Compared to the earth mantle the sea floor propagates Rayleigh (and Scholte) waves of much smaller wavelength, and moreover the ratio of shear to compressional wave-velocity is lower by a factor of about 10.

Keywords

Phase Velocity Marine Sediment Rayleigh Wave Elastic Parameter Water Coverage 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Dziewonski, A., S. Bloch, and M. Landisman, A technique for the analysis of transient seismic signals, Bull. Seim. Soc. Am. 59, 427–444, 1969Google Scholar
  2. Hamilton, E.L., Shear-wave velocity versus depth in marine sediments: a review, Geophysics 41, 985–996, 1976CrossRefGoogle Scholar
  3. Haskell, N.A., The dispersion of surface waves on multilayered media, Bull. Seimol. Soc. Am. 43, 17–34, 1953Google Scholar

Copyright information

© Plenum Press, New York 1980

Authors and Affiliations

  • Heinz-H. Essen
    • 1
  1. 1.Institut für GeophysikUniversität HamburgHamburg 13Germany

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