[CIG-SHORT] Question about normal slip of points along the fault
Charles Williams
willic3 at gmail.com
Tue Aug 22 20:14:13 PDT 2017
Dear Teng,
You are correct that the normal slip doesn’t seem to show up in Paraview. I believe this must be a rounding issue. When I look at the HDF5 file, it appears that opening slip with absolute values greater than 1.0e-5 occurs for time steps 69 and greater, on nodes 1804-1807. These nodes are not quite at the center of your mesh (slightly to the right), and we have the following:
>>> coords[1804:1808,:]
array([[ 0. , 2575.51243781],
[ 0. , 2563.00995025],
[ 0. , 2550.50746269],
[ 0. , 2538.00497512]])
>>> slip[68:70,1804:1808,:]
array([[[ 6.89918509e-01, 5.03786406e-04],
[ 6.84512853e-01, 2.90598425e-03],
[ 6.76231093e-01, 4.27721576e-03],
[ 6.65871813e-01, 1.48424451e-03]],
[[ 8.21537711e-01, -6.18814173e-03],
[ 8.20121053e-01, -6.61874706e-03],
[ 8.16053970e-01, -5.52545028e-03],
[ 8.08475567e-01, -5.13870352e-03]]])
slip[106:110,1804:1808,:]
array([[[ 3.22609558, -0.00405558],
[ 3.2170178 , -0.00427933],
[ 3.2045508 , -0.00417583],
[ 3.1879853 , -0.00531141]],
[[ 3.27816325, -0.0040641 ],
[ 3.26907165, -0.00429604],
[ 3.25659285, -0.00419845],
[ 3.24001916, -0.00533315]],
[[ 3.33065722, -0.00405906],
[ 3.32156487, -0.00428167],
[ 3.30908228, -0.00417447],
[ 3.29249541, -0.00530886]],
[[ 3.38360076, -0.00405536],
[ 3.37449161, -0.00428148],
[ 3.3619885 , -0.00418184],
[ 3.34538406, -0.0053216 ]]])
I’ve just printed out a few time steps as an example. It appears that the ratio of normal slip to shear slip decreases with time. I’m actually not sure what a reasonable amount of normal slip would be — maybe Brad knows. Can you send the .json file that Brad mentioned? That will tell us the settings you’ve been using.
Cheers,
Charles
> On 23/08/2017, at 2:33 PM, Li, Teng <tengli2 at illinois.edu> wrote:
>
> Hi,
>
> Please find the attachments. The first file is xmf file which can be viewed in Paraview. However, I don't see any slip y value in Paraview in all time steps. And I use Matlab to postprocess fault.h5 file and obtain the results. Please find the two pictures for details. As we can see, four points have normal slip.
>
> Here are the Matlab code to find the slip:
>
> hinfoh=hdf5info('/Desktop/fault.h5');
> coords=hdf5read(hinfoh.GroupHierarchy.Groups(1).Datasets(1));
> slip=hdf5read(hinfoh.GroupHierarchy.Groups(3).Datasets(1));
>
> After opening the variable slip, I find normal slip in columns 1805 - 1808 after time step 69. I am wondering why we have value here in fault.h5 file and we can not see the normal slip in fault.xmf file in Paraview? And I used pylith --nodes=2 to run the .cfg file in my personal Macbook. I am wondering whether this can cause some wrong datas in the output fault.h5 file?
>
> 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 Brad Aagaard [baagaard at usgs.gov]
> Sent: Tuesday, August 22, 2017 3:22 PM
> To: cig-short at geodynamics.org
> Subject: Re: [CIG-SHORT] Question about normal slip of points along the fault
>
> Teng,
>
> Is this a quasi-static simulation? If so, is the solution converging at
> every time step?
>
> If you are using PyLith v2.2.0, please send the JSON parameters file
> that is generated during the run.
>
> Regards,
> Brad
>
>
> On 8/22/17 12:52 PM, Li, Teng wrote:
>> 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>
>>>
>>>
>>>
>>> <Positive_values.png><Negative.png>_______________________________________________
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>>> CIG-SHORT at geodynamics.org <mailto:CIG-SHORT at geodynamics.org>
>>> http://lists.geodynamics.org/cgi-bin/mailman/listinfo/cig-short
>>
>> *Charles Williams I Geodynamic Modeler
>> GNS Science **I** Te Pῡ Ao*
>> 1 Fairway Drive, Avalon 5010, PO Box 30368, Lower Hutt 5040, New Zealand
>> *Ph* 0064-4-570-4566 I *Mob* 0064-22-350-7326 I *Fax* 0064-4-570-4600*_
>> _**http://www.gns.cri.nz/* *I* *Email: **C.Williams at gns.cri.nz*
>> <mailto:your.email at gns.cri.nz>
>>
>
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> <fault.xmf><Normal_slip_Time_69.jpg><Normal_slip_Time_70.jpg><fault.h5>_______________________________________________
> CIG-SHORT mailing list
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Charles Williams I Geodynamic Modeler
GNS Science I Te Pῡ Ao
1 Fairway Drive, Avalon 5010, PO Box 30368, Lower Hutt 5040, New Zealand
Ph 0064-4-570-4566 I Mob 0064-22-350-7326 I Fax 0064-4-570-4600
http://www.gns.cri.nz/ <http://www.gns.cri.nz/> I Email: C.Williams at gns.cri.nz <mailto:your.email at gns.cri.nz>
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