[CIG-SEISMO] CIG-SEISMO Digest, Vol 69, Issue 6

[Yingzi Ying]

Hi Dylan,

I am in similar situation to do 2d simulations with some velocity 
structures, but with fluid-solid coupling...

One solution to is to supply with "DATA/model_velocity.dat_input" which 
defines value in each GLL points. I tried this method but no success. 
PS. I have reported my problem here but no response...

Another way is to give value of each spectral element, that you can 
define "nbmodels" and "nbregions" in "DATA/Par_file" with your own.

If you have any better solution, please also let me know.

Good luck,
Yingzi
On 10/30/2013 03:14 PM, cig-seismo-request at geodynamics.org wrote:
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>     1. SPECFEM2D - random velocity models and meshing (Dylan Mikesell)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 30 Oct 2013 10:42:51 -0400
> From: Dylan Mikesell <mikesell at MIT.EDU>
> To: cig-seismo at geodynamics.org
> Subject: [CIG-SEISMO] SPECFEM2D - random velocity models and meshing
> Message-ID:
> 	<CADgqVRb+3JFKBvTF7c5VChkhPsv7HKiNOLk-q78Gd=ULucOM8w at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Dear SPECFEM2D group,
>
> I have a question regarding meshing and the EXAMPLES/INDUSTRIAL_FORMAT
> example.
>
> I would like to simulate p-wave propagation with SPECFEM2D in the attached
> velocity model.
> (the left plot shows the background velocity field, the right plot shows
> the field after draping a random perturbation field over the background. I
> am using the right plot for simulation).
>
> I was trying to use/understand the INDUSTRIAL_FORMAT example so that I
> could just drop this velocity model into place and go. I have a SeisUnix
> velocity model. As far as I could tell, that example created a mesh with
> xmeshfem2D and then mapped some given SEP velocity model onto that mesh
> using a nearest neighbor routine. I can modify things to get an SU model to
> work, but I am not sure that is the way I need to go.
>
> Since I do not know too much about the meshing, I thought I would ask the
> pros. Will the internal xmeshfem2D work for this velocity model or should I
> use something else? I see Gmsh in the 2D user manual and Cubit in the 3D
> Cartesian user manual.
>
> The boundary conditions are not a big deal at the moment. I see there is a
> little extra work to get PMLs using the external meshers.
>
> Thank you for any thoughts.
>
> Dylan
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