# Some questions about strikeslip-2d

**URL:** <https://community.geodynamics.org/t/some-questions-about-strikeslip-2d/3707>\
**Category:** PyLith\
**Created:** [October 17, 2024, 6:08am UTC](https://community.geodynamics.org/t/some-questions-about-strikeslip-2d/3707 "2024-10-17T06:08:27Z")\
**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:** [October 17, 2024, 6:08am UTC](https://community.geodynamics.org/t/some-questions-about-strikeslip-2d/3707/1 "2024-10-17T06:08:27Z")

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Hello,

I have completed the strikeslip-2d simulation. After completing the static co-seismic slip, I can use `pylith_viz` to visualize the deformation. But how can I quantitatively inspect the parameters of the simulation results, such as the deformation velocity field?

I also have another question: if I want to study the viscosity of the upper mantle in a region, how can I perform inversion using PyLith? I would appreciate some guidance or ideas.

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:** [October 17, 2024, 2:08pm UTC](https://community.geodynamics.org/t/some-questions-about-strikeslip-2d/3707/2 "2024-10-17T14:08:14Z")

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The data in the HDF5 files output from PyLith can be loaded into many visualization tools (pylith\_viz, ParaView, Visit) and software tools (Matlab, Python, C/C++). You can perform additional post-processing and analysis using these tools.

For quasi-static problems, the solution field only contains displacement, so you will have to post-process the results to compute velocity.

To constrain the viscosity of the upper mantle in a region using PyLith, I would start with a sensitivity study that examines the range of values given constraints from observations, etc. PyLith does not yet have data assimilation and adjoint capabilities to directly constrain material properties; this is a feature we would like to add.