[CIG-SEISMO] [Specfem3D Cartesian]- Using a CMTSOLUTION source to trigger a critically-stressed fault

[Dimitri Komatitsch]

Dear Ge Li,

Thank you very much for your email and for your interest in the work of 
the community around the package.

Yes, if you want to mimic an extended source using a kinematic source 
model, you can use many CMTSOLUTION sources that are triggered at 
different times and at slightly different locations (see e.g. the 
discussion about extended sources around equation (A12) of 
http://komatitsch.free.fr/preprints/GJI_1999_figure16_error_fixed_equation3_typo_fixed.pdf, 
and the way we mimic a Hamming quasi-plane wave using 1000 such sources 
in http://komatitsch.free.fr/preprints/Ultrasonics_Moysan_2016.pdf 
figure 5).

If you want a dynamic rupture source model, i.e. something more 
sophisticated, the package can do that based on the great work of 
Jean-Paul Ampuero, Surendra Nadh Somala, Kangchen Bai and other people 
in the community, they can give you more details (they will know much 
more about this than I do :-)
Let me thus cc them.

Best regards,
Dimitri.

On 04/05/2018 03:00 AM, Ge Li wrote:
> To Whom It May Concern:
> 
> I’m a PhD Candidate in geophysics at McGill University. Currently I’m using
> 
> Specfem3D Cartesian for my research.
> 
> I’m wondering is it possible to trigger an earthquake on a fault using a 
> CMTSOLUTION source?
> 
> I tried several simulations by setting a critically stressed fault and a 
> CMTSOLUTION point source.
> 
> The source (Mw~6 Right-lateral strike slip) was located about only 1km 
> away from the fault surface.
> 
> But it turned out the stresses on the fault surface(dynamic 
> slip-weakening) remain unchanged.
> 
> Based on these tests, I supposed that a CMTSOLUTION won’t change the 
> stress level on a fault surface. Is it correct?
> 
> Or did I miss something here?
> 
> Thanks! I’m looking forward to your reply!
> 
> -- 
> 
> *Ge Li*
> 
> /Ph.D. Candidate/
> 
> /Department of Earth & Planetary Science, /
> 
> /McGill University/
> 
> /3450 University Street/
> 
> /Montreal, QC, Canada /
> 
> /H3A 0E8/
> 
> /ge.li2 at mail.mcgill.ca <mailto:ge.li2 at mail.mcgill.ca>/
> 
> 
> 
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-- 
Dimitri Komatitsch, CNRS Research Director (DR CNRS)
Laboratory of Mechanics and Acoustics, Marseille, France
http://komatitsch.free.fr