IFOS (subwavelength DEtail resolving Nonlinear Iterative SEismic inversion) is a 2D elastic full waveform inversion code.
IFOS (Inversion of Full observed seismograms) 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)