An overview of Marchenko-based redatuming: Past, present, (and future)

Marchenko-based redatuming methods aim to produce full-waveform propagators from single-sided reflection data and an estimate of the subsurface velocity model. In this talk, I will first review various alternative approaches proposed in the literature and discuss how they differ from each other and from the original formulation of Wapenaar et al (2014). Using a common notation throughout, the key novelty of each method will be highlighted as well as their strengths and limitations with respect to application to field data. Finally, I will discuss the way forward, both in terms of implementation details (e.g., 3D) and theoretical advances (e.g., active role of multiples), that are the topics of current research in the community and can be seen as key enablers for a more widespread use of the Marchenko equation in geophysical applications.