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Combining Discontinuous Galerkin with Finite Differences to Simulate Seismic Waves in Presence of Free-surface Topograph
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 76th EAGE Conference and Exhibition 2014, Jun 2014, Volume 2014, p.1 - 5
Abstract
We present an original algorithm for numerical simulation of seismic wave propagation in models with complex topography along a free surface and other near-surface complexities. Conventional methods such as finite-difference seismic modeling either generate many artifacts or require an extremely fine discretization grid that is computationally expensive. The new approach combines discontinuous Galerkin in the complex near-surface part of the model with conventional rectangular finite-difference modeling for the deeper, less complex part. Using a triangular mesh in the near surface allows more accurate description of topography without artifacts or excessive discretization, while additional computation costs are minimized by only applying it to shallow portions of the subsurface models.