[CIG-SEISMO] single force solution
Sevan Adourian
sevan.adourian at berkeley.edu
Wed Apr 12 23:55:32 PDT 2017
Hi Dimitri,
Yes I'm currently in Paris and I'd be happy to meet with you at ENS! I think I solved my problem though, and as thought in a first place, it's not really related to specfem.. Sorry to have brought the subject here..
Thanks a lot for the help,
Sévan
На 12 апр. 2017 г., 16:45, в 16:45, Dimitri Komatitsch <komatitsch at lma.cnrs-mrs.fr> написал:п>
>Hi Sevan, Hi all,
>
>This is very good news, it will be very interesting.
>
>I think Jessica Irving was also working on this with a student at
>Princeton but I am not sure how far they went (and I do not know if it
>was with SPECFEM; for sure they have not committed changes to SPECFEM).
>
>Are you based in Paris or in Berkeley? If you are in Paris we could
>meet
>at ENS on May 10 if you want to discuss that (it would be easier with a
>
>pen and paper + white board :-) , I will be in Paris for a meeting and
>would have time to stop by.
>
>Thanks,
>Best wishes,
>
>Dimitri.
>
>On 04/12/2017 03:26 PM, Sevan Adourian wrote:
>> Hi Dimitri,
>>
>> Thanks for your answer! Yes, I'm continuing Yder's work on box
>> tomography, and I'm trying to allow the stations to be outside of the
>> box (which is why I need to compute the Green's functions from an
>> "outside" receiver to each point of the mirror for a later
>convolution
>> with the wavefield). In my case I need to couple SPECFEM with a
>slightly
>> modified RegSEM.
>>
>> But reading what you describe, the problem might still come from me
>> because the issues I'm facing are on the SPECFEM side only. So if you
>> tell me it already worked, I might still do something wrong.
>>
>> Regards,
>> Sévan
>>
>> On Wed, Apr 12, 2017 at 3:10 PM, Dimitri Komatitsch
>> <komatitsch at lma.cnrs-mrs.fr <mailto:komatitsch at lma.cnrs-mrs.fr>>
>wrote:
>>
>>
>> Hi Sevan,
>>
>> Yes, in earlier work
>> (http://komatitsch.free.fr/preprints/GJI2_Vadim_2015.pdf
>> <http://komatitsch.free.fr/preprints/GJI2_Vadim_2015.pdf> and
>> http://komatitsch.free.fr/preprints/Geology_Chevrot_2016.pdf
>> <http://komatitsch.free.fr/preprints/Geology_Chevrot_2016.pdf>)
>we
>> have coupled SPECFEM3D with DSM and that worked fine, however
>more
>> recently we have tried to couple SPECFEM3D with AxiSEM to do FWI
>> locally with our wavefield injection technique (also similar to
>e.g.
>> Masson and Romanowicz's box tomography approach) and so far we
>get
>> some weird extra phases, possibly something we are doing wrong in
>> some rotations. Not sure if the problem is the same as yours, it
>> could also be a small mistake we made in the representation
>theorem
>> coupling integral or something like that.
>>
>> Since you are at Berkeley, is this related to what Yder was
>doing?
>> (I think he was using finite differences, not SPECFEM?).
>>
>> Thanks,
>> Best wishes,
>>
>> Dimitri.
>>
>> On 04/12/2017 03:01 PM, Sevan Adourian wrote:
>>
>> Hi Hom Nath and Dimitri,
>>
>> Alright then, I'll be waiting for the tests of your new
>version
>> then!
>> Dimitri, may I ask you which problems you have faced in the
>Green's
>> functions computation you mentioned earlier? Do you also have
>one
>> component that is satisfying reciprocity? I'm asking because
>I'm
>> trying
>> to couple specfem with another external code as well.
>>
>> Thanks and regards,
>> Sévan
>>
>> On Wed, Apr 12, 2017 at 1:51 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,
>>
>> New implementation is very similar, but the source time
>function
>> will have several options. I make it more general because
>some
>> people were interested on a moving source with sine
>source time
>> function, for exampme.
>>
>> Best,
>> Hom Nath
>>
>>
>> On Wed, Apr 12, 2017, 7:36 AM 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 Hom Nath and Dimitri,
>>
>> Thank you Dimitri and Hom Nath for the feedback. Hom
>> Nath, will
>> your new implementation be on the model of what's
>done in
>> specfem Cartesian (i.e. with the FORCESOLUTION file),
>> and will
>> it support a source that is not on a node of an
>element
>> without
>> relocating this source? And will it still use a
>ricker as a
>> source time function?
>>
>> Thanks,
>> Sévan
>>
>>
>> On Wed, Apr 12, 2017 at 1:24 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 Dimitri,
>>
>> I will commit!
>>
>> Best,
>> Hom Nath
>>
>> On Wed, Apr 12, 2017, 7:09 AM Dimitri Komatitsch
>> <komatitsch at lma.cnrs-mrs.fr
>> <mailto:komatitsch at lma.cnrs-mrs.fr>
>> <mailto:komatitsch at lma.cnrs-mrs.fr
>> <mailto: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>
>> <mailto:komatitsch at lma.cnrs-mrs.fr
>> <mailto:komatitsch at lma.cnrs-mrs.fr>>
>> <mailto:komatitsch at lma.cnrs-mrs.fr
>> <mailto:komatitsch at lma.cnrs-mrs.fr>
>>
>> <mailto: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>>
>> <mailto:hgharti at princeton.edu
>> <mailto:hgharti at princeton.edu>
>> <mailto:hgharti at princeton.edu
>> <mailto:hgharti at princeton.edu>>>
>> > > <mailto:hgharti at princeton.edu
>> <mailto:hgharti at princeton.edu> <mailto:hgharti at princeton.edu
>> <mailto:hgharti at princeton.edu>>
>> <mailto: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>>
>> > <mailto:sevan.adourian at berkeley.edu
>> <mailto:sevan.adourian at berkeley.edu>
>> <mailto:sevan.adourian at berkeley.edu
>> <mailto:sevan.adourian at berkeley.edu>>>
>> > <mailto:sevan.adourian at berkeley.edu
>> <mailto:sevan.adourian at berkeley.edu>
>> <mailto:sevan.adourian at berkeley.edu
>> <mailto:sevan.adourian at berkeley.edu>>
>>
>> > <mailto: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>>
>> <mailto:sevan.adourian at ens.fr
>> <mailto:sevan.adourian at ens.fr>
>> <mailto:sevan.adourian at ens.fr
>> <mailto:sevan.adourian at ens.fr>>>
>> > <mailto:sevan.adourian at ens.fr
>> <mailto:sevan.adourian at ens.fr>
>> <mailto:sevan.adourian at ens.fr
>> <mailto:sevan.adourian at ens.fr>>
>> <mailto: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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>> <mailto:CIG-SEISMO at geodynamics.org>
>> <mailto:CIG-SEISMO at geodynamics.org
>> <mailto:CIG-SEISMO at geodynamics.org>>>
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>> <mailto:CIG-SEISMO at geodynamics.org>
>> <mailto:CIG-SEISMO at geodynamics.org
>> <mailto:CIG-SEISMO at geodynamics.org>>
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>> > >
>> >
>>
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>>
>>
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><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>
>>
>>
><http://lists.geodynamics.org/cgi-bin/mailman/listinfo/cig-seismo
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><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>>
>> <mailto:sevan.adourian at ens.fr
>> <mailto:sevan.adourian at ens.fr>
>> <mailto:sevan.adourian at ens.fr
>> <mailto:sevan.adourian at ens.fr>>>
>> > <mailto:sevan.adourian at ens.fr
>> <mailto:sevan.adourian at ens.fr>
>> <mailto:sevan.adourian at ens.fr
>> <mailto:sevan.adourian at ens.fr>>
>> <mailto: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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>> <mailto:CIG-SEISMO at geodynamics.org>
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>> <mailto: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>
>>
>>
><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
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>>
>>
><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
>> >
>> _______________________________________________
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>> <mailto:CIG-SEISMO at geodynamics.org
>> <mailto:CIG-SEISMO at geodynamics.org>>>
>> >
>>
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>>
>>
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><http://lists.geodynamics.org/cgi-bin/mailman/listinfo/cig-seismo>>
>> >
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>>
><http://lists.geodynamics.org/cgi-bin/mailman/listinfo/cig-seismo
><http://lists.geodynamics.org/cgi-bin/mailman/listinfo/cig-seismo>>>
>> >
>> >
>> >
>> >
>> >
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>> >
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><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
>>
>_______________________________________________
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>>
>>
>>
>>
>> --
>> 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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>>
>>
>>
>>
>> --
>> 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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>>
>> --
>> Dimitri Komatitsch, CNRS Research Director (DR CNRS)
>> Laboratory of Mechanics and Acoustics, Marseille, France
>> http://komatitsch.free.fr
>> _______________________________________________
>> CIG-SEISMO mailing list
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>>
><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>
>>
>>
>> _______________________________________________
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>>
>
>--
>Dimitri Komatitsch, CNRS Research Director (DR CNRS)
>Laboratory of Mechanics and Acoustics, Marseille, France
>http://komatitsch.free.fr
>_______________________________________________
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