About

This document contains training material for geophysical forward modeling and inversions using SimPEG and Geoscience ANALYST.

Table of contents

• Fundamentals
• Tutorials
• Case Studies
• Depth of Investigation
• Plate Simulation
  • Interface
  • Batch Simulations
  • Plate Matching
• Third Party Software

Running the applications

The main entry point to the various modules are the *.ui.json files. The ui.json serves a dual purpose:

(1) rendering a user-interface in Geoscience ANALYST

(2) storing the input parameters chosen by the user for the program to run. See the UIJson documentation for more information about the ui.json interface.

The various user-interfaces can be accessed from the Geoscience ANALYST Pro Geophysics menu.

The application can also be run from command line if all required fields in the ui.json are provided. This approach is useful for advanced users who want to automate the mesh creation process or re-run an existing mesh with different parameters.

To run any of the applications, assuming a valid Conda environment, use the following command:

conda activate simpeg-drivers

python -m simpeg-drivers.driver [YOUR.ui.json]

where [YOUR.ui.json] is the path to the input ui.json file on disk.

References

[AVE12]

Christiansen A.V. and Auken E. A global measure for depth of investigation. Geophysics, 4:WB171–WB177, 2012.

[FO19]

D. Fournier and D.W. Oldenburg. Inversion using spatially variable mixed ℓp norms. Geophysical Journal International, 218:268–282, 2019. doi:10.1093/gji/ggz156.

[GM03]

Luis A. Gallardo and Max A. Meju. Characterization of heterogeneous near-surface materials by joint 2d inversion of dc resistivity and seismic data. Geophysical Research Letters, 2003. doi:10.1029/2003GL017370.

[HCK+17]

Lindsey J. Heagy, Rowan Cockett, Seogi Kang, Gudni K. Rosenkjaer, and Douglas W. Oldenburg. A framework for simulation and inversion in electromagnetics. Computer and Geosciences, 2017. URL: https://www.sciencedirect.com/science/article/pii/S0098300416303946?via%3Dihub, doi:10.1016/j.cageo.2017.06.018.

[LYO99]

Li Y. and D. W. Oldenburg. Estimating depth of investigation in dc resistivity and ip surveys. Geophysics, 2:403–416, 1999.

[LiO98]

Y. Li. and D. W. Oldenburg. 3-d inversion of gravity data. Geophysics, 63:109–119, 1998.

[LiO00]

Y. Li. and D. W. Oldenburg. Incorporating geological dip information into geophysical inversions. Geophysics, 65:148–157, 2000.

[NM89]

Nabighian, M. N. and J. C. Macnae. Time-domain electromagnetic prospecting methods. Volume 2. Society of Exploration Geophysicists, 1989.

[TASY95]

A N Tikhonov, V Y Arsenin, V V Stepanov, and A G Yagola. Numerical methods for the solution of ill-posed problems. Volume 328. Springer, Washington, D.C., 1995.

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