Extended Data Fig. 1: Distribution of events and stations used in this study.
From: Detections of ultralow velocity zones in high-velocity lowermost mantle linked to subducted slabs
A total of 143 events (stars) with a magnitude of more than Mb 6.0 and a depth of more than 300 km recorded by broad-band and short-period stations (triangles) were used for SKKKP B-caustic diffractions analyses. The events that show SKKKP or its B-caustic diffractions are marked with orange stars, while the events that do not show these seismic waves are marked with cyan stars. The red points and purple points indicate the theoretical core entry point and core exit point at B-caustic distance for event-station pairs with SKKKP B-caustic diffractions. The contours are drawn for reference at the –0.5% S-wave velocity level from tomographic model S40RTS at a depth of 2,850 km.
