[CIG-SEISMO] Fwd: Attenuation

[Dimitri Komatitsch]

Dear Anamika,

That paper is old, it is more or less this except that in the current 
version we accommodate QKappa in addition to Qmu, i.e. we also handle 
non-deviatoric terms, and we compute the convolutions more accurately, 
typically using:

         ! update e1, e11, e13 in convolution formulation with modified 
recursive convolution scheme on basis of
         ! second-order accurate convolution term calculation from 
equation (21) of
         ! Shumin Wang, Robert Lee, and Fernando L. Teixeira,
         ! Anisotropic-medium PML for vector FETD with modified basis 
functions,
         ! IEEE Transactions on Antennas and Propagation, vol. 54, no. 
1, (2006)

Best regards,
Dimitri.

On 01/10/2018 07:22 PM, Anamika Pandey wrote:
> 
> Dear Seismo team,
> 
> I am seeking some help regarding the attenuation implementation in Specfem.
> I just want to be sure for some of my literature surveys before getting 
> into the
> Specfem source code. Followings are my queries, I would be very grateful 
> for
> your input
> 
> 1.) Are equations (5)-(8) from paper KomatitschandTromp-1999 (I am 
> attaching the paper for your reference) considered,
> so it has been actually solved in the time domain or Fourier frequency 
> domain?
> 
> 2.) In case, these equations have been simulated what is the initial 
> condition of equation(6)?
> 3.) How to get the stress and strain relaxation time?
> 
> 
> 
> Thank you very much!
> Anamika
> 
> 
> 
> -- 
> anamika
> 
> 
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-- 
Dimitri Komatitsch, CNRS Research Director (DR CNRS)
Laboratory of Mechanics and Acoustics, Marseille, France
http://komatitsch.free.fr