We use SW4 2.01 ( Sjögreen and Petersson, 2012; Petersson and Sjögreen, 2012; Petersson and Sjögreen, 2017; Petersson and Sjögreen, 2015; Petersson and Sjögreen, 2017) published under the GPL 2 license.
We thank the Computational Infrastructure for Geodynamics (http://geodynamics.org) which is funded by the National Science Foundation under awards EAR-0949446 and EAR-1550901.
Sjögreen, B.; Petersson, N.A. (2012), A Fourth Order Accurate Finite Difference Scheme for the Elastic Wave Equation in Second Order Formulation, Journal of Scientific Computing, 52 (1) , 17-48, doi: 10.1007/s10915-011-9531-1, url: http://link.springer.com/10.1007/s10915-011-9531-1
Petersson, N.A.; Sjögreen, B. (2012), Stable and efficient modeling of anelastic attenuation in seismic wave propagation, Communications in Computational Physics, 12 (01) , 193-225
Petersson, N.A.; Sjögreen, B. (2017), User's guide to SW4, version 2.0, LLNL-SM-741439 (LLNL-SM-741439)
Petersson, N.A.; Sjögreen, B. (2015), Wave propagation in anisotropic elastic materials and curvilinear coordinates using a summation-by-parts finite difference method, Journal of Computational Physics, 299, 820-841, doi: 10.1016/j.jcp.2015.07.023, url: http://linkinghub.elsevier.com/retrieve/pii/S0021999115004684
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