Figure 2: 1D shear velocity structure and phase velocity dispersion curves with anisotropy profiles.
From: The initiation of segmented buoyancy-driven melting during continental breakup
(a) The predicted phase velocity dispersion curve (red) obtained from the average 1D shear velocity profile for the region fits well with the average phase velocity dispersion curve (black) for the whole region. Black horizontal bars show 3 × s.e. Regional phase velocity dispersion curves (dashed) are determined using a subset of the nodes used for the whole region. (b) The sensitivity kernels calculated from DISPER80 (ref. 58) are shown for representative periods between 20 and 100 s. (c) The average regional 1D shear velocity model (orange) is up to 11% lower than the starting model (purple), which combines CRUST 1.0 (0–40 km) and ak135 (40–250 km), at depths >50 km. Black rectangles show the average error in shear velocity over well-resolved depth ranges. Errors are obtained from a Monte-Carlo estimate (100,000 random perturbations from our best-fit model) showing the range of possible solutions to the inversion that fit the dispersion curve within error. Resolution at 25, 50, 75, 112 and 167 km is shown as vertical black lines. (d) Magnitude and azimuth (black rectangles) of anisotropy for our well-resolved periods is shown. The region was divided into six separate zones each solved separately for anisotropy.
