[CIG-SHORT] Question about normal slip of points along the fault

[Li, Teng]

Dear Charles,

We have a 2d model in my problem. And in this region, where I have normal slip, both normal traction and shear traction become zero. In the beginning, all the points in this region have positive normal slip, and the maximum slip is 0.004. Then, the points have negative normal slip, the values are between -0.006 to -0.003.

And I will use Paraview to see the possible normal slip of the points along the fault.

Best,
Teng


Teng Li

Master Candidate in Structures

Department of Civil and Environmental Engineering

University of Illinois at Urbana-Champaign

205 North Mathews Ave, Urbana, IL. 61801

Phone:(217)8196210, Email: tengli2 at illinois.edu



________________________________
From: CIG-SHORT [cig-short-bounces at geodynamics.org] on behalf of Charles Williams [willic3 at gmail.com]
Sent: Monday, August 21, 2017 11:04 PM
To: cig-short at geodynamics.org
Subject: Re: [CIG-SHORT] Question about normal slip of points along the fault

Dear Teng,

Is this a 2D or 3D problem?  If it’s 2D then slip(:,2) should be the normal slip.  If it’s 3D I think it should be slip(:,3) (I’m not a Matlab user, but I believe it uses 1-based indexing).  If there is actually normal slip, how large is it?

You should be able to look at the VTK files in Paraview.  Just open the fault VTK file and view ‘slip’.  Then select the component you want to view.

Cheers,
Charles


On 22/08/2017, at 3:02 PM, Li, Teng <tengli2 at illinois.edu<mailto:tengli2 at illinois.edu>> wrote:

Hi,

I have some questions about the normal slip of the points along the fault. Please find the attachments.

I output the slip(:,2) in matlab to obtain the normal slip of all the points along the fault in my model. And I use open_free_surface=False to make sure the initial traction still exists when the fault opens. However, I find certain points have normal slip. In some time steps, they have positive normal slip, while in some other times, they have negative normal slip. I am wondering why they have the normal slip in 2 different directions?

And the second picture is the slip convention in pylith-2.2.0 manual. It is in the page 119/268. I think the meaning is that the positive normal slip is the fault opening direction.

And in the third picture, I see negative values of fault opening implys penetration.

Since the penetration is never allowed, I wonder why we have both positive and negative slip results? Is it due to the incomplete or wrong .vtk output?

And is there a way to see the fault opening using Paraview? I think using Paraview to visualize those points can help me figure out the meaning of their normal slips.

Hope for your reply!

Best,
Teng




Teng Li

Master Candidate in Structures

Department of Civil and Environmental Engineering

University of Illinois at Urbana-Champaign

205 North Mathews Ave, Urbana, IL. 61801

Phone:(217)8196210, Email: tengli2 at illinois.edu<mailto:tengli2 at illinois.edu>



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