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Stiffness Reduction Method for Finite-element Scheme Elastic Wave Modelling in Heterogeneous Media - An Alternative to PML
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 78th EAGE Conference and Exhibition 2016, May 2016, Volume 2016, p.1 - 5
Abstract
An effective absorbing boundary condition is imperative to rule out spurious reflections at the artificial boundaries. Among all the absorbing boundary techniques, PML is one of the most developed and popular. However, PML is complicated and computational expensive for elastic wave modelling based on the finite-element scheme, e.g., finite element method (FEM) and spectral element method (SEM). Hence, we introduce a stiffness reduction method (SRM) in elastic wave simulation and extend this method to fit heterogenous media. Thus, we build a rugged elastic heterogenous medium and test three possible scenarios to implement SRM by using FEM. Finally, we compare these three solutions with the one obtained by using PML. Numerical results suggest that SRM can yield comparable performance to that of PML, yet put up an easier implementation.