Outdated and archived; examples moved to the manual. See https://empymod.readthedocs.io/en/stable/examples.

Examples for empymod

0. Published results
1. Frequency-domain examples
2. Time-domain examples
3. Comparison to analytical solution
4. Add-ons
5. Reproducing published results
6. Tools
7. Explanations and educational material

0. Published results in other repositories

• See article-tle2017 for:

  Werthmüller, D., 2017, Getting started with controlled-source electromagnetic 1D modeling: The Leading Edge, 36, 352-355; doi: 10.1190/tle36040352.1.

  Contains 2 notebooks with eight frequency- and time-domain examples.

• See article-geo2017 (in the notebooks-directory) for:

  Werthmüller, D., 2017, An open-source full 3D electromagnetic modeler for 1D VTI media in Python: empymod: Geophysics, 82(6), WB9-WB19; DOI: 10.1190/geo2016-0626.1.

  Contains:

  • Comparison to analytical solution
  • FHT filter comparison
  • GPR example
  • Time-domain example

• See article-fdesign (in the notebooks-directory) for:

  Werthmüller, D., K. Key, and E. Slob, 2018, A tool for designing digital filters for the Hankel and Fourier transforms in potential, diffusive, and wavefield modeling: Geophysics, 84(2), F47-F56; DOI: 10.1190/geo2018-0069.1.

  Contains:

  • Examples regarding the design of digital filters for the Hankel and Fourier transforms
  • GPR example with a digital filter

• See csem-ziolkowski-and-slob for:

  Ziolkowski, A., and E. Slob, 2019, Introduction to Controlled-Source Electromagnetic Methods: Cambridge University Press; ISBN 9781107058620.

  Contains all numerical examples of the book, 61 in total, frequency- and time-domain.

1. Frequency-domain examples

• 1a_Frequency_Single-and-Crossplot
  Frequency example, for a single frequency and crossplot frequency vs offset.

• 1b_Frequency_Dipole-vs-Bipole
  Comparison of a 800 m long bipole with a dipole at its centre.

• 1c_Comparison_of_Source-Receiver_Combinations
  Comparison of all source-receiver combinations; electric and magnetic.

2. Time-domain examples

• 2a_Time_Step-and-Impulse
  Comparison of QWE, FHT, FFTLog, and FFT for frequency-to-time transformation.

• 2b_DC_rho-a_Dipole-Dipole
  Example of DC apparent resistivity calculation for the dipole-dipole arrangement.

• 2c_Note_regarding_land_CSEM
  A note on how to improve the result for land CSEM (source and receiver located at the interface between air and subsurface).

• 2d_Cole-Cole_IP
  How to define a cole-cole model to calculate IP.

• 2e_Using_empymod_transforms_with_other_modellers
  How to use the transform utilities with other modellers.

3. Comparison to analytical solution

• 3a_Full-Diffusive_comparison
  Comparison of the diffusive with the full wavefield analytical full-space solutions.

• 3b_Halfspace-Dipole_comparison
  Comparison of analytical with dipole for half- and fullspaces.

4. Add-ons

• 4a_TMTE-split
  Contributions of up- and downgoing TM- and TE-modes.

• 4b_Digital-Linear-Filter_design
  Design a Digital Linear Filter (DLF) for the Hankel transform.

5. Reproducing published results

• 5a_CSEM
  So far: Constable and Weiss (2006); Ziolkowski et al. (2007).

• 5b_FEM_TEM
  So far: Ward and Hohmann (1988).

6. Tools

• 6a_Benchmark
  Example benchmark to check which method is best for a given problem.

• 6b_Profiling
  Example for profiling the code.

7. Explanations and educational material

• 7a_DLF-Standard-Lagged-Splined
  Graphical explanation of the different optimisation methods for the DLF.

• 7b_Dipoles_and_Loops
  Difference between magnetic dipole and loop sources.