Extended Data Fig. 7: Synthetic seismograms for 1D model and 2D ULVZ models with different P-wave velocity variations on the receiver side.
From: Detections of ultralow velocity zones in high-velocity lowermost mantle linked to subducted slabs
a, AK135 model. b-f, 2D sinusoid-shaped ULVZ models with a thickness of 30 km, a width of 60 km, and a P-wave velocity increase of 6% (b), a P-wave velocity reduction of 6% (c), a P-wave velocity reduction of 8% (d), a P-wave velocity reduction of 12% (e), a P-wave velocity reduction of 20% (f). All the waveforms are aligned with the theoretical arrival times of SKKKP and its B-caustic diffractions (red lines) and filtered with 0.5–1.0 Hz.
