Fig. 2
![Fig. 2](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40623-022-01590-w/MediaObjects/40623_2022_1590_Fig2_HTML.png)
Example of the RTM imaging procedure along line SJ1901. a Preprocessed record and b RTM image section of the OBS record at No. 30, which overlaid with the migration velocity model. c Raw stacked result of RTM sections from all OBSs, and d the final filtered RTM image. The red dashed line circles denote approximate locations of the Moho reflections identified on the OBS record at No. 30 along SJ1901