[CIG-SEISMO] single force solution
Hom Nath Gharti
hgharti at princeton.edu
Wed Apr 12 04:24:14 PDT 2017
Hi Dimitri,
I will commit!
Best,
Hom Nath
On Wed, Apr 12, 2017, 7:09 AM Dimitri Komatitsch <komatitsch at lma.cnrs-mrs.fr>
wrote:
>
> Hi Hom Nath,
>
> Perfect, thanks!
> Then please remember to commit it to GitHub.
>
> Best regards,
> Dimitri.
>
> On 04/12/2017 01:06 PM, Hom Nath Gharti wrote:
> > Hi Sévan,
> >
> > I am about to finish new point force implementation. I will let you know
> > once it is ready for testing.
> >
> > Best,
> > Hom Nath
> >
> > On Wed, Apr 12, 2017 at 6:36 AM, Dimitri Komatitsch
> > <komatitsch at lma.cnrs-mrs.fr <mailto:komatitsch at lma.cnrs-mrs.fr>> wrote:
> >
> >
> > Hi Sevan,
> >
> > I guess you can keep cc'ing the list because it is an issue Clément,
> > Vadim, Paul, Sébastien and I have been facing as well in our coupling
> > with external codes, thus we are interested in knowing more about the
> > potential problem.
> >
> > Thanks,
> > Best wishes,
> > Dimitri.
> >
> > On 04/12/2017 11:24 AM, Sevan Adourian wrote:
> > > Hi Hom Nath,
> > >
> > > Thanks for your answer and concern. Since you suggest something
> that is
> > > not directly "specfem related", can I send you directly an email
> so that
> > > we can discuss it? And then I can post the solution once we'll
> find it,
> > > in order to close the topic!
> > >
> > > Thanks again,
> > > Sévan
> > >
> > > On Tue, Apr 11, 2017 at 8:46 PM, Hom Nath Gharti <
> hgharti at princeton.edu <mailto:hgharti at princeton.edu>
> > > <mailto:hgharti at princeton.edu <mailto:hgharti at princeton.edu>>>
> wrote:
> > >
> > > Hi Sévan,
> > >
> > > Do you also switch the orientations of source and receiver?
> > >
> > > Thanks,
> > > Hom Nath
> > >
> > > On Tue, Apr 11, 2017 at 1:39 PM, Sevan Adourian
> > > <sevan.adourian at berkeley.edu
> > <mailto:sevan.adourian at berkeley.edu>
> > <mailto:sevan.adourian at berkeley.edu
> > <mailto:sevan.adourian at berkeley.edu>>>
> > > wrote:
> > >
> > > Hi cig-seismo community,
> > >
> > > I'm trying to compute Green's functions using
> Specfem3D-Globe,
> > > using a single force point source solution coupled with a
> > source
> > > time function that basically represents a filtered Dirac
> > delta.
> > > In order to test my implementation, I imposed a source at a
> > > point A and looked at the obtained Green's function at a
> > > receiver B. Then, I switched the position of the source
> > and the
> > > receiver and compared the 2 in order to check the
> > reciprocity of
> > > those Green's functions.
> > >
> > > It turned out that I have a perfect reciprocity (in the
> > > frequency band that correspond to my filtered Dirac delta)
> > only
> > > on the component in which I input the force, while the
> other
> > > components don't quite match.
> > >
> > > I strongly suspected a reference frame rotation issue, so I
> > > tried to input the force in the global xyz coordinate
> system
> > > (i.e. adding the force directly in the accel_crust_mantle
> > array
> > > in the comp_add_sources subroutine, without multiplying
> > with the
> > > nu_source matrix) and looked at the Green's functions in
> this
> > > xyz coordinates system (ie, directly writing in the
> > seismograms
> > > structure the values of ux, uy and uz computed in the
> > > compute_seismogram subroutine), but I still have this
> issue.
> > > Would anyone have an idea of where this probable rotation
> > issue
> > > could come from?
> > >
> > > I'm working on specfem3D-Globe v6.0.0.
> > >
> > > Thanks in advance for your help!
> > > Sévan
> > >
> > > --
> > > Sevan Adourian
> > > Masters Student at Ecole Normale Superieure de Paris
> > > sevan.adourian at ens.fr <mailto:sevan.adourian at ens.fr>
> > <mailto:sevan.adourian at ens.fr <mailto:sevan.adourian at ens.fr>>
> > >
> > >
> > >
> > > _______________________________________________
> > > CIG-SEISMO mailing list
> > > CIG-SEISMO at geodynamics.org <mailto:CIG-SEISMO at geodynamics.org>
> > <mailto:CIG-SEISMO at geodynamics.org <mailto:CIG-SEISMO@
> geodynamics.org>>
> > >
> > http://lists.geodynamics.org/cgi-bin/mailman/listinfo/cig-seismo
> > <http://lists.geodynamics.org/cgi-bin/mailman/listinfo/cig-seismo>
> > >
> > <http://lists.geodynamics.org/cgi-bin/mailman/listinfo/cig-seismo
> > <http://lists.geodynamics.org/cgi-bin/mailman/listinfo/cig-seismo>>
> > >
> > >
> > >
> > >
> > > --
> > > Sevan Adourian
> > > Masters Student at Ecole Normale Superieure de Paris
> > > sevan.adourian at ens.fr <mailto:sevan.adourian at ens.fr>
> > <mailto:sevan.adourian at ens.fr <mailto:sevan.adourian at ens.fr>>
> > >
> > >
> > > _______________________________________________
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> > > 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>
> >
> >
> >
> >
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> > 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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