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Authors: Peter, D.* 
Komatitsch, D.* 
Luo, Y.* 
Martin, R.* 
Le Goff, N.* 
Casarotti, E.* 
Le Loher, P.* 
Magnoni, F.* 
Liu, Q.* 
Blitz, C.* 
Nissen-Meyer, T.* 
Basini, P.* 
Tromp, J.* 
Title: Forward and adjoint simulations of seismic wave propagation on fully unstructured hexahedral meshes
Issue Date: 2011
Series/Report no.: /186 (2011)
DOI: 10.1111/j.1365-246X.2011.05044.x
Keywords: Tomography
Computational seismology
Wave propagation
Subject Classification04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous 
04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis 
05. General::05.01. Computational geophysics::05.01.99. General or miscellaneous 
05. General::05.01. Computational geophysics::05.01.05. Algorithms and implementation 
Abstract: We present forward and adjoint spectral-element simulations of coupled acoustic and (an)elastic seismic wave propagation on fully unstructured hexahedral meshes. Simulations benefit from recent advances in hexahedral meshing, load balancing and software optimization. Meshing may be accomplished using a mesh generation tool kit such as CUBIT, and load balancing is facilitated by graph partitioning based on the SCOTCH library. Coupling between fluid and solid regions is incorporated in a straightforward fashion using domain decomposition. Topography, bathymetry and Moho undulations may be readily included in the mesh, and physical dispersion and attenuation associated with anelasticity are accounted for using a series of standard linear solids. Finite-frequency Fre ́chet derivatives are calculated using adjoint methods in both fluid and solid domains. The software is benchmarked for a layercake model. We present various examples of fully unstructured meshes, snapshots of wavefields and finite-frequency kernels generated by Version 2.0 ‘Sesame’ of our widely used open source spectral-element package SPECFEM3D.
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