[CIG-SEISMO] using SPECFEM3D fot simulating gravity perturbation / PS

[Dimitri Komatitsch]

Dear Surendra, dear all,

Thanks a lot! I will add your paragraph below to the users manual in a 
few minutes. Very useful.

Best regards,
Dimitri.

On 04/04/2018 08:23 PM, Surendra Nadh Somala wrote:
> Dear Dimitri,
> 
> I think Yixin Yao is looking for a feature that I had implemented during 
> my Caltech days (way back in 2013) but never made it to manual, although 
> it is still in the master github repository of Specfem3D.  We had a 
> publication eventually on it in 2015 whose link is given below:
> https://authors.library.caltech.edu/58337/1/Geophys.%20J.%20Int.-2015-Harms-1416-25.pdf
> 
> The title of that article: "Transient gravity perturbations induced by 
> earthquake rupture" sounds more like what Yixin Yao asked for in the 
> first email.
> 
> The only documentation we currently have for this feature is in a 
> standalone README file that can be found here:
> doc/how_to/README_gravityPerturbation_bis.txt 
> <https://github.com/geodynamics/specfem3d/blob/ff24d4062e223aa976c338b45fd4eb568ad1558a/doc/how_to/README_gravityPerturbation_bis.txt>
> 
> Could you please add a note about this new feature in the manual where 
> you may feel relevant (probably with a clarification that this differs 
> from Martin Roland's work on gravity integrals/field calculation) and 
> request the users of this feature to cite the following article.
> Harms, J., J.-P. Ampuero, M. Barsuglia, E. Chassande-Mottin, J.-P. 
> Montagner,S. N. Somalaand B. F. Whiting (2015)/Transient gravity 
> perturbations induced by earthquake rupture/, Geophysical Journal 
> International, 201 (3), 1416-1425 doi:10.1093/gji/ggv090
> 
> Regards,
> Surendra
> 
> 
> 
> 
> 
> ___________
> *Surendra Nadh Somala*
> Assistant Professor
> Department of Civil Engineering (Block-E, 208)
> Indian Institute of Technology (IIT) Hyderabad
> Kandi, Sangareddy
> Telangana, India - 502285
> Phone : +91 (0)40 2301-8457
> http://civil.iith.ac.in/surendra/
> 
> On Tue, Apr 3, 2018 at 8:14 PM, Dimitri Komatitsch 
> <komatitsch at lma.cnrs-mrs.fr <mailto:komatitsch at lma.cnrs-mrs.fr>> wrote:
> 
> 
>     Dear Yixin Yao,
> 
>     Please also make sure you get a recent version of the code, for
>     instance by typing this:
> 
>     git clone --recursive --branch devel
>     https://github.com/geodynamics/specfem3d.git
>     <https://github.com/geodynamics/specfem3d.git>
> 
>     because the current version of the users manual says this:
> 
>     "OTHER ANNOUNCEMENT: SPECFEM3D can now perform gravity field
>     calculations in addition (or instead of) seismic wave propagation
>     only. See flag GRAVITY_INTEGRALS in file setup/constants.h.in
>     <http://constants.h.in>.
>     Please also refer to
>     http://komatitsch.free.fr/preprints/GJI_Martin_gravimetry_2017.pdf
>     <http://komatitsch.free.fr/preprints/GJI_Martin_gravimetry_2017.pdf>.
>     And yes, that is the reason why I added a falling apple on the cover
>     of the manual :-)"
> 
>     Best regards,
>     Dimitri.
> 
>     On 04/03/2018 04:38 PM, Dimitri Komatitsch wrote:
> 
> 
>         Dear Yixin Yao,
> 
>         Thank you for your interest in our work on this. You are right,
>         by lack of time the gravity integrals are not very well
>         documented in the users manual, however they are explained in
>         detail in this paper:
>         http://komatitsch.free.fr/preprints/GJI_Martin_gravimetry_2017.pdf
>         <http://komatitsch.free.fr/preprints/GJI_Martin_gravimetry_2017.pdf>
> 
>         You can also find the flags to use in file setup/constants.h.in
>         <http://constants.h.in>, there is a section with flags about
>         gravity integrals, called "gravity integral calculations".
> 
>         Best regards,
>         Dimitri.
> 
>         On 04/02/2018 04:04 PM, yaoyixin1989 at 163.com
>         <mailto:yaoyixin1989 at 163.com> wrote:
> 
>             Dear prof.,
>             I am a PhD student of Institute of Geodesy and Geophysics,
>             Chinese Academy of Sciences.I am interested in gravity
>             perturbation caused by an earthquake, and I try to do the
>             simulation by using SPECFEM3D software. These days, I have
>             searched the manual clearly, but I didn't find the detailed
>             discription about gravity perturbation.
>             What should I do, is there a detailed manual about how to
>             simulate the gravity perturbation?
>             Thank you very much for your kind consideration and I am
>             looking forward to your reply!
> 
>             Sincerely, yours
>             Yixin Yao
>             ------------------------------------------------------------------------
>             yaoyixin1989 at 163.com <mailto:yaoyixin1989 at 163.com>
> 
> 
>             _______________________________________________
>             CIG-SEISMO mailing list
>             CIG-SEISMO at geodynamics.org <mailto:CIG-SEISMO at geodynamics.org>
>             http://lists.geodynamics.org/cgi-bin/mailman/listinfo/cig-seismo
>             <http://lists.geodynamics.org/cgi-bin/mailman/listinfo/cig-seismo>
> 
> 
> 
>     -- 
>     Dimitri Komatitsch, CNRS Research Director (DR CNRS)
>     Laboratory of Mechanics and Acoustics, Marseille, France
>     http://komatitsch.free.fr
>     _______________________________________________
>     CIG-SEISMO mailing list
>     CIG-SEISMO at geodynamics.org <mailto:CIG-SEISMO at geodynamics.org>
>     http://lists.geodynamics.org/cgi-bin/mailman/listinfo/cig-seismo
>     <http://lists.geodynamics.org/cgi-bin/mailman/listinfo/cig-seismo>
> 
> 

-- 
Dimitri Komatitsch, CNRS Research Director (DR CNRS)
Laboratory of Mechanics and Acoustics, Marseille, France
http://komatitsch.free.fr