[CIG-SHORT] Problem with fault intersection in 3D simulations

[Josimar Alves da Silva]

Hi Brad,

Thanks a lot for your comments. The approach you suggest (not removing vertices
on the strike-slip fault from the thrust fault ) worked well and solved my
problem.

thank you,
Josimar




On Wed, Feb 14, 2018 at 11:35 AM, Brad Aagaard <baagaard at usgs.gov> wrote:

> On 02/14/2018 07:16 AM, Josimar Alves da Silva wrote:
>
>> Hi Surendra,
>>
>> Thank you for your suggestion ! I am able to run my simulation fine now
>> and I don't get the previous error message. In this approach what you
>> suggest is to split the Thrust fault in two different faults that are not
>> connected (with the strike slip fault between them). I assume that the new
>> Thrust fault segments are allowed to slip independently now, correct ?
>>
>
> When you have two faults that intersect in an X-style intersection, you
> need to pick one fault to be the through-going fault and one to be split
> into two segments (which should be treated as completely independent faults
> with their own nodesets, buried edges, spatial databases, etc). It sounds
> like you picked the strike-slip fault to be the through-going fault. In
> that case, the two segments of the thrust fault will be separated; if the
> thrust fault slips without any slip on the strike-slip fault, there will be
> a region of zero slip along the intersection with the strike-slip faults.
>
> If you remove the vertices of the strike-slip fault from the thrust fault,
> you need to mark the vertices that are along that edge as buried edges.
> Otherwise, the fault will be extended one cell past the edge (as shown in
> the attached image from the troubleshooting tutorial; you should create a
> nodeset corresponding to the buried edges of the purple region).
>
> Charles, do you have any comments regarding this solution proposed by
>> Surendra ? Have you done something similar in the past ?
>>
>
> The preferred approach for fault intersections is to NOT remove the
> vertices on the strike-slip fault from the thrust fault. Simply include
> those vertices in the buried edges of the thrust fault while treating the
> thrust fault as two completely separate faults. Note that you must list the
> through-going fault FIRST in the list of interfaces, so that it is created
> first and then the two thrust fault segments.
>
> Brad
>
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