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f Calculation of Traveltimes by Gridded Rays in 3D Media
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 60th EAGE Conference and Exhibition, Jun 1998, cp-110-00137
- ISBN: 978-90-73781-09-2
Abstract
Traveltimes are useful in Kirchhoff migration, seismic modeling and tomography. They can be computed efficiently and precisely by integration of the eikonal equation on a regular grid, through a finite-difference method (Van Trier and Symes, 1991; Vidale, 1990). Unfortunately, this approach is potentially unstable because of the Courant-Friedrich-Levy stability condition that might not be satisfied in certain directions, unless the vertical step is kept small. This reduces the efficiency.