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AGU: Geophysical Research Letters

 

Index Terms

  • Exploration Geophysics: Seismic methods
  • Seismology: Earthquake ground motions and engineering
  • Seismology: Surface waves and free oscillations
  • Seismology: Theory and modeling

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 31, L20602, 4 PP., 2004
doi:10.1029/2004GL021007

Surface wave dispersion from small vertical scatterers

K. van Wijk

Physical Acoustics Laboratory, Department of Geophysics, Colorado School of Mines, Golden, Colorado, USA

A. L. Levshin

Department of Physics, University of Colorado, Boulder, Colorado, USA

Heterogeneity in the subsurface creates conflicting types of dispersion of seismic waves. A laboratory and numerical experiment show that multiple scattering of elastic waves from isolated heterogeneities near the surface not only attenuates, but also delays coherent events. Because scattering off these impedance contrasts is frequency dependent, multiple scattering is a source of dispersion. If ignored, multiple scattering dispersion could be erroneously attributed to a model with horizontal homogeneous layers of different wave speeds.

Received 13 July 2004; accepted 15 September 2004; published 23 October 2004.

Citation: van Wijk, K., and A. L. Levshin (2004), Surface wave dispersion from small vertical scatterers, Geophys. Res. Lett., 31, L20602, doi:10.1029/2004GL021007.

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