Fig. 3 | Nature Communications

Fig. 3

From: Compositional heterogeneity near the base of the mantle transition zone beneath Hawaii

Fig. 3

Precursor amplitudes as a function of distance. a and b are for 410 and 660, respectively. Dashed black and red lines are S410S and S660S reflection coefficients calculated from PREM27 and estimated for the study region, respectively. Gray circles are measured amplitude ratios, with 2σ uncertainties estimated from bootstrapping48. Green dashed lines depict background noise (estimated in a time window [600–350] s before SS). Reflection coefficients are inferred from amplitude ratios upon correction for geometric spreading, intrinsic attenuation, and incoherent stacking, and only the most reliable coefficients (black circles in the white sections) are used to constrain Δβ and Δρ. Red curves show the best fit based on grid search in (Δβ, Δρ) space

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