# Specfem2d: How can i set a gradual velocity model?

**URL:** <https://community.geodynamics.org/t/specfem2d-how-can-i-set-a-gradual-velocity-model/800>\
**Category:** General\
**Created:** [September 11, 2019, 10:46am UTC](https://community.geodynamics.org/t/specfem2d-how-can-i-set-a-gradual-velocity-model/800 "2019-09-11T10:46:01Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![fabilim](https://avatars.discourse-cdn.com/v4/letter/f/dec6dc/32.png) [@fabilim](https://community.geodynamics.org/u/fabilim)\
**Post date:** [September 11, 2019, 10:46am UTC](https://community.geodynamics.org/t/specfem2d-how-can-i-set-a-gradual-velocity-model/800/1 "2019-09-11T10:46:01Z")

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Dear all,

is it possible to assign a gradual velocity model to a layer in the underground model instead of just giving a constant value per layer?  
Thanks for any information about this 😉

Best regards,  
Fabian