caa a22 4500 477046967 CHVBK 20180405111333.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/BF00874576 doi (NATIONALLICENCE)springer-10.1007/BF00874576 Wave front construction in smooth media for prestack depth migration [Elektronische Daten] [N. Ettrich, D. Gajewski] We implemented a wave front construction algorithm specifically designed for smooth media for application to prestack depth migration. The highest priority was given to maximum computational speed to allow an extension of the techniques to 3D media. A simple grid-based model representation in combination with fast bilinear interpolation is used. It is shown that this procedure has no distorting effects on the ray tracing results for smooth media. In our implementation, wave front construction (WFC) has proven to be as fast as some of the recently developed methods for travel time computations. WFC has advantages over these methods, since amplitudes and other ray theoretical quantities are available, and it is not restricted to the calculation of only first arrivals. Thus, it meets the requirements for migration in complex media. Furthermore, WFC allows for introduction of a perturbation scheme for computing travel times for slightly varying models simultaneously. This has applications for, e.g., prestack velocity estimation techniques. The importance of later arrivals for migration in complex media is demonstrated by prestack images of the Marmousi data set. Birkhäuser Verlag, 1996 Kirchhoff migration nationallicence ray tracing nationallicence wave front construction nationallicence perturbation nationallicence Ettrich N. Geophys. Inst., Univ. Hamburg, Bundesstr. 55, 20146, Hamburg, Germany aut Gajewski D. Geophys. Inst., Univ. Hamburg, Bundesstr. 55, 20146, Hamburg, Germany aut pure and applied geophysics Birkhäuser-Verlag 148/3-4(1996-09-01), 481-502 0033-4553 148:3-4<481 1996 148 24 https://doi.org/10.1007/BF00874576 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00874576 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ettrich N. Geophys. Inst., Univ. Hamburg, Bundesstr. 55, 20146, Hamburg, Germany aut NATIONALLICENCE 700 1- Gajewski D. Geophys. Inst., Univ. Hamburg, Bundesstr. 55, 20146, Hamburg, Germany aut NATIONALLICENCE 773 0- pure and applied geophysics Birkhäuser-Verlag 148/3-4(1996-09-01), 481-502 0033-4553 148:3-4<481 1996 148 24 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer