Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007geoji.168.1093k&link_type=abstract
Geophysical Journal International, Volume 168, Issue 3, pp. 1093-1104.
Astronomy and Astrophysics
Astronomy
1
Imaging Principle, Least-Squares Inverse Problem, Ray-Based Migration/Inversion, Wavefield Extrapolation
Scientific paper
A modified imaging principle is proposed in order to retrieve the `true amplitude' map of the relative slowness perturbations from multishot surface seismic data. The purpose is to obtain a method applicable with a finite-difference solution of the wave equation and equivalent to the ray-based migration/inversion approach. The proposed modification consists of multiplying the integrand of the classic Claerbout imaging principle by an angle-dependent factor in order to remove the angle dependency and obtain an estimate of the slowness perturbations. It is demonstrated that in high-frequency asymptotics the proposed modified imaging principle is similar to the ray-based inversion. A numerical example based on a 2-D synthetic marine-type seismic data set and a finite-difference wavefield extrapolation shows the relevance of this modification.
Kashtan Boris
Kiyashchenko D.
Plessix R.-É.
Troyan V.
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