Model Parameters

Regular grid model

SpecFWAT requires model file with regular grid in hdf5 format. The model file should contain the following fields in common for all model types:

• x: 1D array of x coordinates (in meters)
• y: 1D array of y coordinates (in meters)
• z: 1D array of z coordinates (in meters)

Isotropic model

For isotropic model, the model file should contain the following fields with the same shape as the 1D array defined by x, y, and z:

• vp: 3D array of P-wave velocity (in m/s)
• vs: 3D array of S-wave velocity (in m/s)
• rho: 3D array of density (in kg/m^3)

Azimuthal anisotropic model

For azimuthal anisotropic model, the model file should contain the following fields with the same shape as the 1D array defined by x, y, and z:

• vp: 3D array of P-wave velocity along vertical direction (in m/s)
• vs: 3D array of S-wave velocity along vertical direction (in m/s)
• rho: 3D array of density (in kg/m^3)
• gcp: 3D array of $cos(2\theta)$ component of $\rho Vp^2$
• gsp: 3D array of $sin(2\theta)$ component of $\rho Vs^2$

Radial anisotropic model (under development)

Path to Model file

The model file name should be tomography_model.h5 in the DATA/${TOMOGRAPHY_PATH}/ directory, where TOMOGRAPHY_PATH is defined in the DATA/Par_file file. The default value of ${TOMOGRAPHY_PATH} is tomo_files.

To generate mesh and databases from this model file, please change MODEL parameter in DATA/Par_file to the external. the MODEL_TYPE parameter in DATA/fwat_params.yml should be set to 1 for isotropic model, 2 for azimuthal anisotropic model.