Extended Data Fig. 8: Sampling regions of SKKKP B-caustic diffractions.
From: Detections of ultralow velocity zones in high-velocity lowermost mantle linked to subducted slabs
a-c, Locations of the sampling regions on different tomographic models. The background models display S-wave velocity tomographic model GyPSuM (a), SEMUCB-WM1 (b) and P-wave velocity tomographic model MIT-P08 (c). Yellow lines indicate the potential sampling regions of SKKKP B-caustic diffractions at the CMB, and their lengths represent the extension lengths. The purple points represent the theoretical core exit point of SKKKP at B-caustic distance for event-station pairs.
