Auxiliary material for Paper 2011JB008650
Distinct layering in the hemispherical seismic velocity structure of Earth's upper inner core
Lauren Waszek and Arwen Deuss
Bullard Laboratories, University of Cambridge, Cambridge, UK
Waszek, L., and A. Deuss (2011), Distinct layering in the hemispherical seismic velocity structure of Earth's upper inner core, J. Geophys. Res., 116, B12313, doi:10.1029/2011JB008650.
Introduction
We investigated the regional velocity structure and scatter throughout each of the layers in an attempt to observe any large-scale non-hemispherical regional variations. Figure S1 contains a plot of each layer separated into 30 degree by 30 degree sections. The color of the circles indicates the average PKIKP-PKiKP differential travel time residuals. The sections with most scatter are those with large quantities of data points and large standard deviation on the average value.
1. 2011jb008650
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Regional variations in scatter within each layer. The layers are subsequently separated into regions of 30 degrees by 30 degrees for analysis. The figures on the left (a, c, e) indicate the number of data points present in each section; the size of the circle increases with more data points, while the colour of the circle corresponding to the average differential travel time residual. The figures on the right (b, d, f) show the standard deviation; the size of the circle is larger for a larger standard deviation, indicating greater spread in the average value and therefore more scatter.