Seismic Observations of Splitting of the Mid-Transition Zone Discontinuity in Earth's Mantle Arwen Deuss and John Woodhouse

Supplementary Material

Supplemental Figure 1. Confidence levels. Stacks with 95% confidence intervals for single reflections and split observations of the mid-transition zone discontinuity. (A) Stack for North America (152 traces) obtained by averaging over three caps compared with a stack in the northeast Pacific (162 traces). (B) Two stacks for Greenland (88 left and 79 traces right). (C) Stack for Africa (107 traces) obtained by averaging over five caps and stack for the Indian Ocean (119 traces). In all these examples, the confidence intervals of the split and single observations are similar for the same number of stacked traces and similar areas.

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Supplemental Figure 2. Resampled stacks. We use a bootstrap resampling algorithm to determine the robustness of the splitting observations. Here, we show ten resampled copies of Fig. 1. This is to show the robustness of the stacks; the splitting is clearly visible in every copy and is especially strong in the four traces on the right of profile bB.

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