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

[Surendra Nadh Somala]

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. Somala and 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> 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
>
> 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.
> Please also refer to http://komatitsch.free.fr/prep
> rints/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
>>
>> You can also find the flags to use in file setup/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 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
>>>
>>>
>>> _______________________________________________
>>> CIG-SEISMO mailing list
>>> CIG-SEISMO at geodynamics.org
>>> 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
> http://lists.geodynamics.org/cgi-bin/mailman/listinfo/cig-seismo
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