# Remove cohesion after slip occurred on the fault?

**URL:** <https://community.geodynamics.org/t/remove-cohesion-after-slip-occurred-on-the-fault/684>\
**Category:** PyLith\
**Tags:** cohesion\
**Created:** [June 20, 2019, 9:08pm UTC](https://community.geodynamics.org/t/remove-cohesion-after-slip-occurred-on-the-fault/684 "2019-06-20T21:08:12Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![EkaterinaBolotskaya](https://avatars.discourse-cdn.com/v4/letter/e/71c47a/32.png) [@EkaterinaBolotskaya](https://community.geodynamics.org/u/EkaterinaBolotskaya)\
**Post date:** [June 20, 2019, 9:08pm UTC](https://community.geodynamics.org/t/remove-cohesion-after-slip-occurred-on-the-fault/684/1 "2019-06-20T21:08:13Z")

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Dear Pylith developers,

Is it possible to assign a fault constitutive model in Pylith (static or slip-weakening) with variable cohesion: nonzero cohesion before sliding starts (while slip is zero) and zero cohesion after?

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:** [June 20, 2019, 9:48pm UTC](https://community.geodynamics.org/t/remove-cohesion-after-slip-occurred-on-the-fault/684/2 "2019-06-20T21:48:59Z")

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PyLith does not have a fault constitutive model that has slip-dependent cohesion. You may be able to generate something with similar behavior by adjusting the static and dynamic coefficients of friction in the slip-weakening fault constitutive model.