Fig. 5: Model recovery using two-dimensional FWI.

a 3D data inverted using 2D FWI. b 2D data inverted using 2D FWI. Left panels show simulated data generated by a single source located at the yellow circle, as recorded on an elliptical array of 512 transducers placed around the head. Centre panels show data recorded by a single receiver located opposite the source; the position of the data shown is indicated by the blue line. Right panels show models recovered using purely two-dimensional FWI. Colour scale as shown in Fig. 3.