Extended Data Fig. 4: Vespagrams and beamforming results of SKKKP and its B-caustic diffractions.
From: Detections of ultralow velocity zones in high-velocity lowermost mantle linked to subducted slabs
a,c,e,g,i, Fourth-root vespagrams of the seismograms shown in Extended Data Fig. 3. The black crosses indicate the theoretical arrival times and slownesses for SKKKP or its B-caustic diffractions calculated with the AK135 model. b,d,f,h,j, Beamforming results of the seismograms shown in Extended Data Fig. 3. The black crosses indicate the theoretical slownesses and back azimuths for SKKKP or its B-caustic diffractions calculated with AK135 model.
