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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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Comparison between empirical formula and SW4 simulation results #225

Open Zzzzsxb opened 3 weeks ago

Zzzzsxb commented 3 weeks ago

Under poor computing conditions, I divided the computational grid into 1000m and resolved the seismic wave frequency to 0.05hz, but the calculated PGA is much higher than the result obtained by GMMS. What is the reason? It stands to reason that low-frequency seismic waves will not produce such a large result.

andersp commented 1 week ago

What is the source time function? When choosing the source frequency, did you follow the instructions in section 4.4 of the user's guide?

Zzzzsxb commented 1 week ago

I used the SRF file generated by Song's Rupture Model Generator

andersp commented 1 week ago

Whenever using sources from a SRF file you must use the prefilter command to limit the frequency content.

Zzzzsxb commented 18 hours ago

Thank you very much, this helps me a lot