6TH International Congress on Technology - Engineering - Kuala Lumpur3 - Malaysia (2018-07-19)

Anisotropic Seismic Wave Simulation Via Pseudo-spectral And Pseudo-acoustic Approximations

Nowadays, the concept of seismic anisotropy is applied widely in seismic modelling, imaging and inversion. To appreciate the influences of seismic anisotropy, an anisotropic wave equation needs to be employed. Although seismic anisotropy is inherently an elastic phenomenon, the elastic anisotropic wave equation is used rarely in anisotropic imaging techniques due to its heavy computational process. Pseudo-acoustic approximations are suggested to mitigate the computational cost, even though, they have a few drawbacks. Pseudo spectral approaches are appropriate alternatives for pseudo acoustic methods. In this paper, we aim to study different techniques applied to simulate seismic wave propagation in anisotropic media. First, the theory and results of a pseudo acoustic wave propagator are demonstrated. Then, a spectral technique based on lowrank approximation for modelling pure acoustic waves is discussed, and we investigate and compare its accuracy and efficiency to the pseudo acoustic method.
Seyed Yaser Moussavi Alashloo, Deva Ghosh, Amir Abbas Babasafari, Yasir Bashir