# What is IFOS?
IFOS (subwavelength DEtail resolving Nonlinear Iterative SEismic inversion) is a 2D elastic full waveform inversion code.
The inversion problem is solved by a conjugate gradient method and the gradients are computed in the time domain with the adjoint method.
The forward modeling is done by a time domain finite difference scheme. The manual is included in the download archive or can be downloaded [here](https://git.scc.kit.edu/GPIAG-Software/IFOS/wikis/home)
# Download and Newsletter
You can Download the [latest Release](https://git.scc.kit.edu/GPIAG-Software/IFOS/tree/Release) or the current [Beta-Version](https://git.scc.kit.edu/GPIAG-Software/IFOS/tree/master)
To receive news and updates please [register](http://www.gpi.kit.edu/Software-FWI.php) on the email list IFOS@lists.kit.edu.
Please use this list also to ask questions on using the software or to report problems or bugs.