[CIG-SEISMO] Problem with external velocity model
Dimitri Komatitsch
komatitsch at lma.cnrs-mrs.fr
Wed Oct 10 04:29:35 PDT 2018
Hi Moritz,
Are you using the internal mesher, or an external model and external mesh?
Thanks,
Dimitri.
On 10/10/2018 07:27 AM, Fehr, Moritz wrote:
> Hi,
>
> I have some issues using an external velocity model with ”low“
> velocities. The model size is 3 x 3 x 2.52 km and the mesh size is 40 m
> in all directions. The velocity model is discretized with 40m as well.
>
> If I use my initial velocity model with minimum velocities Vp = 2263
> m/s and Vs = 1307 m/s the simulation works fine. In the next step I
> wanted to implement a low velocity patch within the initial velocity
> model (see: v_model_patch.png) to investigate the influence of the low
> velocity body. The minimum velocities are Vp = 955 m/s and Vs = 555 m/s
> (blue). The problem is that SPECFEM do not detect these low velocities
> (see output_solver.txt) and the simulation provides the same results as
> the initial simulation. I also tried different mesh sizes and velocity
> model spacing but the problem still remains. Do anybody have an idea
> about the origin of that issue?
>
> Thanks
>
> Moritz
>
> PS: I am using SPECFEM3D Cartesian (Version 3.0) with two GPUs (Tesla
> K40m) and 28 CPUs.
>
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--
Dimitri Komatitsch, CNRS Research Director (DR CNRS)
Laboratory of Mechanics and Acoustics, Marseille, France
http://komatitsch.free.fr
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