Tutorial on the numerical modeling of edge diffracted waves by the ray method |
| |
Authors: | F Hron G H Chan |
| |
Institution: | (1) Department of Physics, University of Alberta, Canada |
| |
Abstract: | Summary The concept of diffracted rays introduced by Keller (1962) opened the way for a ray approach in the numerical modeling of
the diffraction phenomena frequently seen in the seismic field records. Unlike the computation of travel times, which has
never caused any difficulties being governed by the same eikonal equation as are the rays of ordinary seismic body waves,
the evaluation of the diffracted ray amplitude has been another story. In this paper we give a tutorial account of a highly
promising technique for the computation of the ray amplitude of seismic waves diffracted by linear edges on seismic interfaces
originally presented by Klem-Musatov (1980, 1995). We demonstrate the adequacy of this technique on a series of SH synthetic
traces containing diffracted arrivals, some of them diffracted more than once. Our computer program is based on a successful
combination of Klem-Musatov's approach with the zero order approximation of the Asymptotic Ray Theory (Červeny and Hron, 1980).
We showed in the paper that both techniqúes are ideally suited for such a combination, since the ray amplitude evaluation
in each of them is based on the same transport equation. In our tutorial review we present all formulae which are needed for
a practical implementation of the method and provide their physical interpretation, wherver possible, by using the numerical
examples presented in the paper. |
| |
Keywords: | Diffracetd waves Asymptotic Ray Theory Synthetic seismograms Numerical modeling of seismic waves |
本文献已被 SpringerLink 等数据库收录! |
|