Fig. 4

Comparison of the RTM images with different velocity models. The RTM results with the velocity models of (a) − 10% scaling, (b) original, and (c) \(+\) 10% scaling. The upper panels show RTM sections, and the lower panels show the same sections overlaid with the scaled velocity models. The red, blue and yellow arrows in (b) denote the eastward- and westward-dipping reflectors and en-échelon pattern reflectors, respectively, which are visible using the original velocity model. The light blue arrows in (c) indicate the west-dipping reflector that corresponds to that indicated by the blue arrows in (b) and is imaged deeper by higher velocity. The white arrows in (a) denote the eastward-dipping phases that do not clearly correspond to the reflection profile with the original velocity