**IFOS2D** (**I**nversion of **F**ull **O**bserved **S**eismograms) is a 2D elastic full waveform inversion code.
**IFOS2D** (**I**nversion of **F**ull **O**bserved **S**eismograms) is a 2-D 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 inversion problem is solved by a conjugate gradient method and the gradients are computed in the time domain by the adjoint state method.
The forward modeling is done by a time domain finite difference scheme.
The forward modeling is done by a time domain Finite-Difference scheme.
IFOS2D is the reverse (inverse) of our 2D finite difference forward solver [**SOFI2D**](https://git.scc.kit.edu/GPIAG-Software/SOFI2D).
IFOS2D is the reverse (inverse) of our 2-D Finite-Difference forward solver [**SOFI2D**](https://git.scc.kit.edu/GPIAG-Software/SOFI2D).
The [**manual**](https://git.scc.kit.edu/GPIAG-Software/IFOS2D/wikis/home) is included in the download archive or can be downloaded [here](https://git.scc.kit.edu/GPIAG-Software/IFOS2D/wikis/home).
The [**manual**](https://git.scc.kit.edu/GPIAG-Software/IFOS2D/wikis/home) is included in the download archive or can be downloaded [here](https://git.scc.kit.edu/GPIAG-Software/IFOS2D/wikis/home).
# Download and Newsletter
# Download and Newsletter
You can Download the [**latest Release**](https://git.scc.kit.edu/GPIAG-Software/IFOS2D/tags/Release_2.0) or the current [**Beta-Version**](https://git.scc.kit.edu/GPIAG-Software/IFOS2D/tree/master)
You can download the [**latest Release**](https://git.scc.kit.edu/GPIAG-Software/IFOS2D/tags/Release_2.0.1) or the current [**Beta-Version**](https://git.scc.kit.edu/GPIAG-Software/IFOS2D/tree/develop).
To receive news and updates please [register](http://www.gpi.kit.edu/Software-FWI.php) on the email list [IFOS@lists.kit.edu](http://www.gpi.kit.edu/Software-FWI.php).
To receive news and updates please [register](http://www.gpi.kit.edu/Software-FWI.php) on the email list [IFOS@lists.kit.edu](http://www.gpi.kit.edu/Software-FWI.php).
Please use this list also to ask questions on using the software or to report problems or bugs.
Please use this list also to ask questions or to report problems or bugs.