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Title: A robust absorbing layer method for anisotropic seismic wave modeling

When applied to wave propagation modeling in anisotropic media, Perfectly Matched Layers (PML) exhibit instabilities. Incoming waves are amplified instead of being absorbed. Overcoming this difficulty is crucial as in many seismic imaging applications, accounting accurately for the subsurface anisotropy is mandatory. In this study, we present the SMART layer method as an alternative to PML approach. This method is based on the decomposition of the wavefield into components propagating inward and outward the domain of interest. Only outgoing components are damped. We show that for elastic and acoustic wave propagation in Transverse Isotropic media, the SMART layer is unconditionally dissipative: no amplification of the wavefield is possible. The SMART layers are not perfectly matched, therefore less accurate than conventional PML. However, a reasonable increase of the layer size yields an accuracy similar to PML. Finally, we illustrate that the selective damping strategy on which is based the SMART method can prevent the generation of spurious S-waves by embedding the source in a small zone where only S-waves are damped.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [4] ;  [3]
  1. LJK, CNRS, Université de Grenoble, BP 53, 38041 Grenoble Cedex 09 (France)
  2. (France)
  3. ISTerre, Université de Grenoble I, BP 53, 38041 Grenoble Cedex 09 (France)
  4. Géoazur, Université de Nice Sophia-Antipolis, CNRS, IRD, OCA, Villefranche-sur-Mer (France)
Publication Date:
OSTI Identifier:
22382152
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Computational Physics; Journal Volume: 279; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ACCOUNTING; ACCURACY; AMPLIFICATION; ANISOTROPY; COMPUTERIZED SIMULATION; DAMPING; LAYERS; S WAVES; SEISMIC WAVES; SOUND WAVES; WAVE PROPAGATION