“…A single Marchenko method does not exist, and we consider this understanding a concept rather than a method. Many other methods have been derived from this concept, such as fracture compliance characterization (Minato and Ghose, 2016), target‐oriented velocity analysis (Mildner et al ., 2017), extended imaging and inversion (van der Neut et al ., 2017b; Cui, 2020) and monitoring (Wapenaar and Staring, 2018), homogeneous Green's function retrieval (Wapenaar et al., 2016), equations for inverse source problems (van der Neut et al ., 2017a), virtual acoustics (Wapenaar et al ., 2018) and immersive wave simulation (Elison et al ., 2018). Most field test results are with two‐dimensional (2D) implementations on line data (Jia et al ., 2018; Staring et al ., 2018; Brackenhoff et al ., 2019).…”