DBPapers
DOI: 10.5593/SGEM2014/B11/S5.064

HYBRID KINEMATIC-DYNAMIC SEISMIC WAVE MODELLING

A. S. Serdyukov, A. A .Duchkov, E. A .Mamrukov, M .A . Khalikova
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-07-0 / ISSN 1314-2704, June 19-25, 2014, Book 1, Vol. 1, 483-488 pp

ABSTRACT
The efficient hybrid kinematic-dynamic technique for finite-difference (FD) computation and storing the seismic wavefields is presented. At every time step of the FD scheme computations are done only in the moving window, around the first-arrival wave front that is consistent with the dominant wavelength. The specific feature of the proposed method is that all computational arrays: velocity, density, particle velocities e.t.c are stored in the original first-arrival traveltimes increasing order. The presented fashion allows us to obtain significant reduction in memory requirements and CPU time for first-arrival waveform computations. The considered approach allows one to store the wavefield in the window at every time step. That is very useful for constructing gradients for wave-equation based seismic data inversion methods, such as full waveform inversion, reverse time migration, wave equation tomography and other. The proposed forward modelling modelling method is illustrated by numerical examples.

Keywords:geophysics, seismic waves, numerical modelling, finite-difference methods, eikonal equation