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Earth, Planets and Space
Fig. 1 | Earth, Planets and Space

Fig. 1

From: Waveform inversion for 3-D S-velocity structure of D′′ beneath the Northern Pacific: possible evidence for a remnant slab and a passive plume

Fig. 1

a Event-receiver geometry for the data used in this study. The great circle paths which sample the D′′ layer are shown in red, and crosses indicate the turning points at the CMB. Light blue reversed triangles and orange stars show the stations in North America, and the 131 intermediate and deep earthquakes (Additional file 1: Table S1), respectively. Dark blue dots show the lateral distribution of the perturbation points. b The target area of this study. Black solid lines show the cross-sections presented in Fig. 3, and dashed blue curve shows the current plate boundary (e.g., DeMets et al. 1990)

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