Other
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001geoji.145..436h&link_type=abstract
Geophysical Journal International, Volume 145, Issue 2, pp. 436-446.
Other
1
Scientific paper
An explicit expression, based on the second-order Neumann expansion, is derived for computing the gradual evolution of a monochromatic compressional seismic wave as it propagates through a medium, the density of which varies in two dimensions. In particular, the case is considered where these variations take place on a scale that is small with respect to the seismic wavelength. For monochromatic plane waves propagating in a particular direction, a medium containing small-scale inhomogeneities can be replaced by a smoother `apparent' medium. The apparent medium accounts for both first- and second-order scattering effects, is frequency-dependent and also depends on the direction of propagation. Frequency-dependent wave speeds, which can be measured very accurately, can therefore be an indication of the presence of heterogeneities of a much smaller scale than the wavelength of the incident wave. This is of particular interest for seismic imaging.
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