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Perform seismic tomography

The entire inversion process consists of three steps:

  1. perform 1-D model inversion to obtain a better initial model for subsequent relocation and model update;
  2. relocate earthquake in the obtained initial model;
  3. update model parameters and relocate earthquakes simultaneously;

Step 1. 1-D model inversion

Given the three input files

  • Parameter file in YAML format 3_input_params/input_params_step1_1D_inv.yaml.
  • Initial model file in HDF5 format 2_models/model_1d_crust1.0_N61_121_61.h5.
  • Traveltime data file in TEXT format 1_src_rec_files/src_rec_file.dat.

users can perform inversion by

mpirun -n 8 TOMOATT -i 3_input_params/input_params_step1_1D_inv.yaml

The results are output to the folder OUTPUT_FILES/OUTPUT_FILES_step1_1D_inv.

  • The updated model can be found as OUTPUT_FILES/OUTPUT_FILES_step1_1D_inv/final_model.h5.

Step 2. earthquake relocation

Given the three input files

  • Parameter file in YAML format 3_input_params/input_params_step2_reloc.yaml.
  • Initial model file in HDF5 format OUTPUT_FILES/OUTPUT_FILES_step1_1D_inv/final_model.h5.
  • Traveltime data file in TEXT format 1_src_rec_files/src_rec_file.dat.

users can perform inversion by

mpirun -n 8 TOMOATT -i 3_input_params/input_params_step2_reloc.yaml

The results are output to the folder OUTPUT_FILES/OUTPUT_FILES_step2_reloc.

  • The updated catalog can be found as OUTPUT_FILES/OUTPUT_FILES_step2_reloc/src_rec_file_reloc_0030_obs.dat.

Step 3. 3-D model inversion

Given the three input files

  • Parameter file in YAML format 3_input_params/OUTPUT_FILES_step3_inv_reloc.yaml.
  • Initial model file in HDF5 format OUTPUT_FILES/OUTPUT_FILES_step1_1D_inv/final_model.h5.
  • Traveltime data file in TEXT format OUTPUT_FILES/OUTPUT_FILES_step2_reloc/src_rec_file_reloc_0030_obs.dat.

users can perform inversion by

mpirun -n 8 TOMOATT -i 3_input_params/input_params_step3_inv_reloc.yaml

The results are output to the folder OUTPUT_FILES/OUTPUT_FILES_step3_inv_reloc.

  • The updated model can be found as OUTPUT_FILES/OUTPUT_FILES_step3_inv_reloc/final_model.h5.
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