README for IFOS3D=================IFOS3D (Inversion of Full observed seismograms) is a 3D elastic full waveform inversion code. The inversion problem is solved by a conjugate gradient method. The gradients are computed in the frequency domain for discrete frequencies with the adjoint method. The forward modeling is done in the time domain with a finite difference code on a standard staggered grid.Installation instructions can be found in the file INSTALL.A detailed documentation is provided in manual_IFOS3D.pdf.To get started with this code try to run the toy example that is described in the documentation (manual_IFOS3D.pdf).If you use this code for your own research please cite at least one articlewritten by the developers of the package, e.g.Butzer, S., Kurzmann, A., & Bohlen, T., 2013. 3D elastic full-waveform inversion of small-scale heterogeneities in transmission geometry, Geophysical Prospecting, 61(6), 1238-1251.Contact:see file AUTHORS