[CIG-SEISMO] SPECFEM3D - determining the effectiveness of absorbing boundaries

[Shahar Barak]

Sorry, I didn't know CPML was already implemented in the latest version.
When I try to use it I get the message:

CPML not implemented for USE_DEVILLE_PRODUCTS for now, set
USE_DEVILLE_PRODUCTS to false in constants.h and recompile; we will add
support for this soon; exiting for now...

However, every time I compile the code the USE_DEVILLE_PRODUCTS in
constants.h is set back to true...


On Thu, Nov 28, 2013 at 7:25 AM, Shahar Barak <shaharb at stanford.edu> wrote:
> Is CPML part of the code?
>
>
> On Thu, Nov 28, 2013 at 4:24 AM, Dimitri Komatitsch
> <komatitsch at lma.cnrs-mrs.fr> wrote:
>>
>> Hi Shahar,
>>
>> You should switch to CPML; Stacey-Clayton-Enquist is obsolete.
>> Later today I'll send you a draft that my group has just submitted about
>> CPML for forward and adjoint problems, in which we compare sensitivity
>> kernels based on CPML and based on Stacey and show that the CPML version
is
>> much cleaner.
>>
>> Best regards,
>> Dimitri.
>>
>>
>> On 11/27/2013 09:39 PM, Shahar Barak wrote:
>>>
>>> Hi,
>>>
>>> I understand from the references in the manual that the absorbing
>>> boundaries in SPECFEM3D is not perfect. For just using the absorbing
>>> boundaries in the code ( ABSORBING_CONDITIONS Set to .true. to turn on
>>> Clayton-Enquist absorbing boundary conditions ), i.e., without adding
>>> special constraints on the edges such as larger attenuation at the
>>> edges, are there any quantitatively guidelines/suggestions on how far
>>> away should the mesh edges be, given a source type and moment
>>> magnitude?
>>> Also, is the effectiveness of absorbing boundaries scalable? i.e., if
>>> I run tests on a small source within a small volume and find the size
>>> of volume needed in order to eliminate boundary returns, would that
>>> scale by a constant to a larger mesh and a larger source, keeping the
>>> size of mesh elements with respect to the size of the volume the same?
>>> Has anyone done such tests for SPECFEM3D? are there publications?
>>>
>>> Thanks,
>>>
>>> Shahar Barak
>>> =======================================
>>> Crustal Geophysics Research Group
>>> Department of Geophysics, Stanford University
>>> 397 Panama Mall, Stanford CA 94305-2215
>>> Mitchell Building, room 463
>>> Office: (650) 725 8229
>>> Cell: (650) 276 6169
>>> shaharb at stanford.edu
>>> _______________________________________________
>>> CIG-SEISMO mailing list
>>> CIG-SEISMO at geodynamics.org
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>>>
>>
>> --
>> Dimitri Komatitsch
>> CNRS Research Director (DR CNRS), Laboratory of Mechanics and Acoustics,
>> UPR 7051, Marseille, France    http://komatitsch.free.fr
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