[CIG-SEISMO] specfem2D vertical incidence of planar waves

[giuseppe.digiulio at ingv.it]

I add the Bielak conditions in my Par_file but it does not fully work .
Disturbances remain on the left and rigth sides of my models yet  
(shown in the attached *ps files).
Likely some other errors are in my trial of vertically-incident plane  
wave in conjunction to an external mesh.

Thanks
Giuseppe

Dimitri Komatitsch <komatitsch at lma.cnrs-mrs.fr> ha scritto:

>
> Dear Giuseppe,
>
> You probably simply forgot to set
>
> add_Bielak_conditions           = .true.,
>
> which is needed to combine plane waves with absorbing boundaries.
> (I am not sure if we say it in the manual; I will check tomorrow and  
> add it if needed).
>
> Best regards,
> Dimitri.
>
> On 10/08/2012 04:57 PM, giuseppe.digiulio at ingv.it wrote:
>> Dear users of SPECFEM,
>>
>> I am looking to run specfem2d with a vertical incident plane wave. My
>> 2D model is very simple (3 uniform layers) based on an external mesh
>> (by means of gmsh).
>>
>> I propagated P waves (source_type 1) but I noted strange boundary
>> effects starting from the left and right sides of my model (see the
>> vector displacement field in the *ps files). These effects produce
>> strong interferences  on the *BHX* component, and  my receivers
>> (situated at the surface) show a  *BHX* component comparable to *BHZ*
>> component in amplitude.
>>
>> The same disturbance happens using a SV wave as input (in this case a
>> P component soon arises from the left and right sides of the model).
>> Likely I wrong something. Hints aimed to simulate a vertically
>> incident wave in 2D models are welcome.
>>
>> Thanks in advance
>>
>>
>> Regards,
>> Giuseppe Di Giulio
>>
>> PS: I attach some input files
>> ----------------------------------------------------------------
>>
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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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