.. image:: ./_static/emsig-logo.svg
:width: 400 px
:align: center
:alt: emsig logo
:target: https://emsig.xyz
:class: dark-light
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========================================
ElectroMagnetic Simulation in Geophysics
========================================
**emsig** are open-source codes to simulate electromagnetic data. Their main
targets are geophysical applications (exploration and monitoring, engineering,
environmental), but they are by no means limited to that. The codes with
extensive documentation are listed on this page. The `emsig GitHub org
`_ contains besides the main codes also related
publications for reproducibility purposes and other associated things of
interest, such as smaller codes which were part of publications.
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.. grid:: 1 2 2 2
:gutter: 2
.. grid-item-card::
:img-top: _static/empymod-logo.svg
3D EM modeller for 1D VTI media
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. button-link:: https://empymod.emsig.xyz
:expand:
:color: info
:click-parent:
empymod.emsig.xyz
The modeller **empymod** can compute electric or magnetic responses due
to a 3D electric or magnetic source in a layered-earth model with
vertical transverse isotropic (VTI) resistivity, VTI electric
permittivity, and VTI magnetic permeability, from very low frequencies
(DC) to very high frequencies (GPR). The computation is carried out in
the wavenumber-frequency domain, and various Hankel- and
Fourier-transform methods are included to transform the responses into
the space-frequency and space-time domains.
++++++
.. code:: bash
pip install empymod
.. code:: bash
conda install -c conda-forge empymod
.. grid-item-card::
:img-top: _static/emg3d-logo.svg
Multigrid solver for 3D EM diffusion
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
.. button-link:: https://emg3d.emsig.xyz
:expand:
:color: info
:click-parent:
emg3d.emsig.xyz
The modeller **emg3d** is a multigrid solver for 3D EM diffusion with
tri-axial electrical anisotropy. The matrix-free solver can be used as
main solver or as preconditioner for Krylov subspace methods, and the
governing equations are discretized on a staggered Yee grid.
++++++
.. code:: bash
pip install emg3d
.. code:: bash
conda install -c conda-forge emg3d
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:fa:`fas fa-users fa-2x` Contributing & Contact
-----------------------------------------------
**emsig** are community codes, please help to shape their future!
.. grid:: 1
:gutter: 2
.. grid-item-card::
:fa:`code fa-2x`
`Submit bugs, fix typos, contribute code, and so much more!
`_
.. grid-item-card::
:fa:`fa-regular fa-comments fa-2x`
Join the **#emsig**-channel on the `SWUNG Chat
`_.
.. grid-item-card::
:fa:`fa-regular fa-envelope fa-2x`
If you prefer personal email you can contact me through
my website `werthmuller.org. `_
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Related ecosystem
=================
**emsig** and its codes are part of a bigger, fast growing, open-source **EM &
Potential Geo-Exploration Python Ecosystem**:
.. raw:: html
MTpy
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.. dropdown:: About the name and logo of emsig
The name **emsig** is an abbreviation in English and a pun in German.
It stands primarily as abbreviation for ElectroMagnetic Simulation in
Geophysics. However, **emsig** is also a German adjective, meaning
*hard-working* or *diligent*. Surely, our codes make our computers work
hard!
Finally, moving to the logo, the **sig**-ending can be seen as the short
form of **sigma**, the symbol generally used for conductivity in
geophysics, one of the elementary properties in electromagnetic modelling.
The «s» in the logo of **emsig** is denoted by «ς», a variation of «σ»
(sigma) in the Greek alphabet.
The symbol itself represents the perpendicularity of electric and magnetic
fields.
.. image:: ./_static/emsig-logo.svg
:class: dark-light