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geodynamics / sw4

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.
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Enhancement: provide a datum parameter #100

Open wmheigl opened 3 years ago

wmheigl commented 3 years ago

In borehole seismic applications, one often has velocity information over certain depth interval only and one is generally not interested in surface phenomena. It would be advantageous to have a datum parameter that allows to have the top of the computational grid not at z=0 but at some chosen depth, thus reducing the size of the computational grid and the computing time.

andersp commented 2 years ago

Thanks for your comment, @wmheigl. You can provide a topography file with negative elevation to remove that part of the computational domain. However, a free surface boundary condition will still be imposed on the top boundary, which probably is not what you want?

wmheigl commented 2 years ago

That is correct, Anders. For my needs I would need absorbing boundaries all around the model.

It’s great to see that you follow up the communities suggestions.

On Jan 13, 2022, at 11:10 AM, Anders Petersson @.***> wrote:

Thanks for your comment, @wmheigl https://github.com/wmheigl. You can provide a topography file with negative elevation to remove that part of the computational domain. However, a free surface boundary condition will still be imposed on the top boundary, which probably is not what you want?

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