[CIG-SEISMO] specfem2D vertical incidence of planar waves

[giuseppe.digiulio at ingv.it]

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
----------------------------------------------------------------

Il contenuto di questa e-mail e' rivolto unicamente alle persone cui  
e' indirizzato, e puo'
contenere informazioni la cui riservatezza e' tutelata.
E' proibita la copia, la divulgazione o l'uso di questo messaggio o  
dell'informazione ivi
contenuta da chiunque altro che non sia il destinatario indicato.
Se avete ricevuto questa e-mail per errore, vogliate cortesemente
comunicarlo immediatamente per telefono, fax o e-mail. Grazie.

This e-mail is intended only for person or entity to which is  
addressed and may contain
information that is privileged, confidential or otherwise protected  
from disclosure.
Copying, dissemination or use of this e-mail or the information herein
by anyone other than the intended recipient is prohibited.
If you have received this
e-mail by mistake, please notify us immediately by telephone, fax or e-mail.
Thank you.