[aspect-devel] Continental extension model

[Mohamed Gouiza]

Hi John,

Thank you for the input file, it will definitely help.

Cheers,
Mohamed

On 10 Oct 2016, at 17:11, John Naliboff <jbnaliboff at ucdavis.edu<mailto:jbnaliboff at ucdavis.edu>> wrote:

Hi Mohamed,

An example continental extension input file is attached, which will be submitted as a cookbook example in the next few days.

In this example, extension is driven by prescribed outflow on the sides and inflow at the base.  The rheology is dislocation creep with different flow laws for the upper/lower crust and mantle.  Internal friction angle (20 degrees) (20 MPa) are within the range of commonly used values.  No strain-weakening, but I have a pull request open that implements this.

Most extension problems include the asthenosphere, while this model only goes down to 100 km.  As such, I would only use this type of setup for studying early stage extension.  Any problems examining extension from start to breakup should extend to at least 150 km. In this case, one might alter the simple boundary conditions I've prescribed.

Hope this helps and let me know you if you have any questions about the input file.

Cheers,
John





*************************************************
John Naliboff
Assistant Project Scientist, CIG
Earth & Planetary Sciences Dept., UC Davis


On 10/10/2016 12:59 AM, Mohamed Gouiza wrote:
Hi John,

I looked for the continental extension model that you showed in the online workshop last month, but couldn’t find it in tests/ folder.
I’ve been running several extension models with the visco-plastic material model and I am interested in knowing the visco-plastic law parameters that you used and how do you prescribe the boundary conditions: is the extension rate defined the same way as in the crustal deformation example in the cookbook by Cedric?

Thank you

-------------------------------------------------
Mohamed Gouiza, Research Fellow
Basin Structure Group, Institute of Applied Geosciences
University of Leeds, School of Earth and Environment
Leeds,  LS2 9JT, UK
M.Gouiza at leeds.ac.uk<mailto:M.Gouiza at leeds.ac.uk>
+44 7985 782073
-------------------------------------------------




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