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Fig. 8 | Progress in Earth and Planetary Science

Fig. 8

From: Stratification of earth’s outermost core inferred from SmKS array data

Fig. 8

V p gradient with respect to PREM for a two-layer outermost core. Contour plot of total residual (in seconds) of d t 3−2, d t 4−3, and d t 5−3 for the two-layered outer core model for the case of V p at the CMB of 8.03 km/s, which give the least residual. The input data are as follows: d t 3−2=1.0, d t 4−3=1.0, and d t 5−3=0.9 for 154° and h = 500 km representing typical values of the Fiji-Tonga data set; and d t 3−2=0.7, d t 4−3=0.9, and d t 5−3=0.9, 162° and h = 590 km, representative of the Argentina data set. The deviation of \(V_{p}^{\prime }\) from PREM (d V p/d r profile - d V p/d r PREM ) for the shallower part of the depth range (vertical axis) and the that of the deeper layer (horizontal axis). The points approximately representing KHOMC, KOCGA, IASP91, and Tanaka-1 are shown by a solid square, solid triangle, open triangle, and open square, respectively

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