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# What is IFOS2D?
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**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 by the adjoint state method.  
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The forward modeling is done by a time domain Finite-Difference scheme.
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IFOS2D is the reverse (inverse) of our 2-D Finite-Difference forward solver [**SOFI2D**](https://git.scc.kit.edu/GPIAG-Software/SOFI2D).
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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).
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# Download and Newsletter
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Release: [![build status](https://git.scc.kit.edu/GPIAG-Software/IFOS2D/badges/master/build.svg)](https://git.scc.kit.edu/GPIAG-Software/IFOS2D/commits/master)  Beta: [![build status](https://git.scc.kit.edu/GPIAG-Software/IFOS2D/badges/develop/build.svg)](https://git.scc.kit.edu/GPIAG-Software/IFOS2D/commits/develop)
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You can download the [**latest Release 2.0.3**](https://git.scc.kit.edu/GPIAG-Software/IFOS2D/tags/Release_2.0.3) or the current [**Beta-Version**](https://git.scc.kit.edu/GPIAG-Software/IFOS2D/tree/develop).
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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).  
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Please use this list also to ask questions or to report problems or bugs.