[CIG-SEISMO] changing the license of SPECFEM from GPLv2+ to GPLv3
Dimitri Komatitsch
komatitsch at lma.cnrs-mrs.fr
Thu Jun 22 10:47:29 PDT 2017
Hi all,
Done!
Dimitri.
On 06/20/2017 03:43 PM, Dimitri Komatitsch wrote:
>
> Hi all,
>
> By the way it would make sense to switch all three SPECFEM packages from
> GPL2+ to GPL3. If nobody disagrees I will do that in 7 days.
>
> (most new packages and Python tools are released under version 3, and we
> use or will use several of them: AxiSEM, ObsPy, pycmt3d etc).
>
> Best regards,
> Dimitri.
>
> On 06/20/2017 03:40 PM, Dimitri Komatitsch wrote:
>>
>> Hi Federica and Emanuele, Hi all,
>>
>> Thanks for your answers. Very useful. I am going to cut and paste them
>> in the manual of SPECFEM and put a copy of cmt3d and of pycmt3d in the
>> Git version of SPECFEM (they are compatible in terms of license,
>> pycmt3d is LGPLv3 and SPECFEM is GPLv2+, which makes the combination
>> GPLv3 according to Wikipedia).
>>
>> best wishes,
>> Dimitri.
>>
>> On 06/20/2017 10:54 AM, Federica Magnoni wrote:
>>> Hi all,
>>>
>>> Initially we used the fortran code cmt3d
>>> (https://github.com/UTCompSeismo/GRD_CMT3D/tree/master/cmt3d) and
>>> recently, as Emanuele said, we switched to the python code pycmt3d.
>>>
>>> Best regards,
>>> Federica
>>>
>>> 2017-06-19 19:53 GMT+02:00 emanuele casarotti
>>> <emanuele.casarotti at gmail.com <mailto:emanuele.casarotti at gmail.com>>:
>>>
>>> You should consider pycmt3d https://github.com/wjlei1990/pycmt3d
>>> <https://github.com/wjlei1990/pycmt3d>
>>>
>>>
>>> Il giorno lun 19 giu 2017 alle 19:48 Dimitri Komatitsch
>>> <komatitsch at lma.cnrs-mrs.fr <mailto:komatitsch at lma.cnrs-mrs.fr>> ha
>>> scritto:
>>>
>>>
>>> Hi Surendra, Hi all,
>>>
>>> Vadim's tool currently inverts for the model only, mostly
>>> because we
>>> developed it for oil industry problems, in which case the
>>> location of
>>> the active source is known. Here is what SPECFEM3D users
>>> classically do
>>> to relocate earthquake sources (paragraph taken from a text
>>> written by
>>> Federica Magnoni and Emanuele Casarotti for Italy):
>>>
>>> "As initial source parameters of the chosen events we use Time
>>> Domain
>>> Moment Tensor solutions (TDMT, Dreger and Helmberger, 1993;
>>> Scognamiglio
>>> et al. 2009) that are calculated by inverting full
>>> three-component
>>> traces of regional broad-band stations using 1D wave speed
>>> models.
>>> Before starting the tomographic inversion, we then exploit the
>>> initial
>>> 3D model of Italy of Di Stefano and Ciaccio (2014) to
>>> recalculate the
>>> source parameters of the considered events. The TDMT solutions,
>>> based on
>>> 1D wave speed models, are considered as initial solutions and we
>>> invert
>>> for the six moment tensor components and the event location by
>>> using the
>>> technique presented in Liu et al. (2004). We use SPECFEM3D to
>>> numerically calculate the Fréchet derivatives with respect to
>>> the source
>>> parameters based on 3D models and we minimize a waveform misfit
>>> function
>>> to invert for source solutions. If the variance reduction of the
>>> solution with the 3D model is significant, this is considered as
>>> the new
>>> moment tensor solution of the event."
>>>
>>> which comes from this paper by Qinya Liu:
>>> http://komatitsch.free.fr/preprints/bssa_Qinya_inversion_2004.pdf
>>> <http://komatitsch.free.fr/preprints/bssa_Qinya_inversion_2004.pdf>
>>> and in
>>> which the derivatives are computed using finite-differences.
>>>
>>> Emanuele and Federica (and Qinya), do you have scripts to do
>>> that?
>>> if so, are they in the package somewhere (or should we consider
>>> committing them?); that would be very useful.
>>>
>>> Thanks,
>>> Best regards,
>>> Dimitri.
>>>
>>> On 06/06/2017 06:31 PM, Surendra Nadh Somala wrote:
>>> > Dear Dimitri,
>>> >
>>> > Are these tomographic inversions or can SPECFEM3D also be
>>> used for
>>> > source inversions?
>>> >
>>> > Thanks,
>>> > 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 <tel:+91%2040%202301%208457>
>>> > http://www.iith.ac.in/~surendra/
>>> <http://www.iith.ac.in/~surendra/>
>>> >
>>> > On Tue, Jun 6, 2017 at 9:56 PM, 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 all,
>>> >
>>> > Vadim Monteiller here in our group has created a nice
>>> integrated FWI
>>> > tool for SPECFEM3D (based on L-BFGS and following
>>> > http://komatitsch.free.fr/preprints/GJI2_Vadim_2015.pdf
>>> <http://komatitsch.free.fr/preprints/GJI2_Vadim_2015.pdf>
>>> > <http://komatitsch.free.fr/preprints/GJI2_Vadim_2015.pdf
>>> <http://komatitsch.free.fr/preprints/GJI2_Vadim_2015.pdf>>
>>> Sections 3
>>> > and 4). The advantage is that it uses no I/Os to disk,
>>> all the
>>> > inversion routines (computing sensitivity kernels,
>>> smoothing them,
>>> > summing, iterating) are called from a single (parallel)
>>> calling
>>> > program and thus only memory is used.
>>> > We have designed a set of examples, which we will put in
>>> BuildBot.
>>> >
>>> > We will release it before the summer, Vadim is finishing
>>> a few final
>>> > tests.
>>> >
>>> > Best regards,
>>> > Dimitri.
>>> >
>>> > --
>>> > 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
>>> <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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>>> >
>>>
>>> --
>>> Dimitri Komatitsch, CNRS Research Director (DR CNRS)
>>> Laboratory of Mechanics and Acoustics, Marseille, France
>>> http://komatitsch.free.fr
>>>
>>>
>>>
>>>
>>> --
>>> Federica Magnoni
>>> Istituto Nazionale di Geofisica e Vulcanologia (INGV)
>>> Via di Vigna Murata, 605
>>> 00143 ROMA, Italy
>>> e-mail: federica.magnoni at ingv.it <mailto:federica.magnoni at ingv.it>
>>>
>>
>
--
Dimitri Komatitsch, CNRS Research Director (DR CNRS)
Laboratory of Mechanics and Acoustics, Marseille, France
http://komatitsch.free.fr
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