[CIG-SEISMO] SW4 2.0 Released

[Tyler Esser]

We are pleased to announce the release of SW4 2.0.

SW4 (Seismic Waves, 4th order) implements substantial capabilities for 3-D
seismic modeling, with a free surface condition on the top boundary,
absorbing super-grid conditions on the far-field boundaries, and an
arbitrary number of point force and/or point moment tensor source terms.
SW4 is available at https://geodynamics.org/cig/software/sw4/ and the
source repository is available at https://github.com/geodynamics/sw4.

Version 2.0 of SW4 implements mesh refinement with hanging nodes. Mesh
refinement is currently supported in the Cartesian portion of the mesh, but
can be used together with realistic topography and heterogeneous isotropic
visco-elastic material models.

This release also marks the completion of the migration of SW4Lite into its
own repository at https://github.com/geodynamics/sw4lite.

Thanks to N. Anders Petersson and Bjorn Sjogreen!
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