Question about complex model application on a regular grid in SPECFEM3D (Marmousi model)

[mswonscsm]

Dear,

I sincerely appreciate your development of SPECFEM3D, which has significantly contributed to the field of seismic modeling. I have successfully used your program to compare results for homogeneous and multilayered models based on the provided examples.

Currently, I would like to apply SPECFEM3D to the Marmousi model, which features a regular grid with varying parameters assigned to each element. I would greatly appreciate your guidance on how to proceed with this application.

Best regards,
Moosoo Won.

[aakash10gupta]

Hi,

You can use a tomography model file to define a model which is more complex than a layered model. You will need to use the MODEL = tomo option in the DATA/Par_file, and set your input model file accordingly. The details are provided in the following section of the user manual - https://specfem3d.readthedocs.io/en/latest/13_changing_the_model/ . I think option 1 of the section titled Using external tomographic Earth models should be most relevant to your case, but feel free to read through the other ways of Changing the Model.

[wangjun-BIM]

Please ask how specfem3d realizes the simulation of regional reduction method, that is, how to reproduce the literature ' Physics-based large-scale deformation analysis of coseismic rupture : A multiscale 3D SEM-MPM framework with application to the Hongshiyan landslide ' as shown in Figure 5.