Back-Propagating into the Future

I discuss the important similarities and distinctions between RTM (Reverse Time Migration), LS-RTM and FWI, and also relate their fundamental reliance upon back-projection to Deep Neural Network training used in many machine learning pursuits. Hence, the title of this newsletter points to the powerful concept that is paving the ways forward for reducing uncertainty in seismic imaging and seismic characterization in coming years. This newsletter is also written to accompany the TechByte webinars on Least-Squares Migration and Illumination vs AVO.