# Some questions about post-seismic simulations

**URL:** <https://community.geodynamics.org/t/some-questions-about-post-seismic-simulations/3840>\
**Category:** PyLith\
**Created:** [December 30, 2024, 3:21pm UTC](https://community.geodynamics.org/t/some-questions-about-post-seismic-simulations/3840 "2024-12-30T15:21:46Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![haung](https://avatars.discourse-cdn.com/v4/letter/h/4bbf92/32.png) [@haung](https://community.geodynamics.org/u/haung)\
**Post date:** [December 30, 2024, 3:21pm UTC](https://community.geodynamics.org/t/some-questions-about-post-seismic-simulations/3840/1 "2024-12-30T15:21:46Z")

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Dear pylith developers:  
In the manual of pylith, it is mentioned that pylith mainly simulates inter-seismic and co-seismic deformation. In my simulation, I want to simulate the post-seismic deformation and constrain it with GNSS data. Post-seismic deformation includes viscoelastic relaxation and post-seismic afterslip, but in the examples, there are not many hints for post-seismic simulation. If I conduct a post-seismic simulation of an earthquake, can you give me some suggestions or tips?  
Thanks!

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**Author:** ![baagaard](https://yyz2.discourse-cdn.com/flex036/user_avatar/community.geodynamics.org/baagaard/32/615_2.png) [@baagaard](https://community.geodynamics.org/u/baagaard)\
**Post date:** [December 30, 2024, 5:04pm UTC](https://community.geodynamics.org/t/some-questions-about-post-seismic-simulations/3840/2 "2024-12-30T17:04:55Z")

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We consider inter-seismic deformation to include post-seismic deformation. PyLith v3 and later do not yet have fault friction to simulate afterslip driven by stress changes (you can use PyLith v2.2.2 for this, refer to `examples/2d/subduction/step04`). You can prescribe afterslip in PyLith v3 and later.

The following examples cover post-seismic deformation with viscoelastic relaxation:

- [Step 7: Slip on Two Faults and Maxwell Viscoelastic Materials — PyLith 4.2.0dev documentation](https://pylith.readthedocs.io/en/latest/user/examples/reverse-2d/step07-twofaults-maxwell.html)
- [Step 2: Earthquake Rupture and Postseismic Relaxation — PyLith 4.2.0dev documentation](https://pylith.readthedocs.io/en/latest/user/examples/subduction-3d/step02-coseismic.html)