Fig. 6

Globally measured d t ³⁻² values. (a) Ray paths corresponding to the measured d t ³⁻². Stars and red triangles show the epicenters and source side CMB entry points of S3KS. Blue portions of the ray paths indicate the segments within the outer core. For the events at Tonga-Fiji and Kermadec, only selected events and ray paths are plotted in order to prevent the figure from becoming excessively cluttered. (b) Measured d t ³⁻² for other large-scale arrays converted to a hypothetical focal depth of 500 km. The d t ³⁻² values predicted by global outer core models are shown with lines. The measured d t ³⁻² are shown by circles with error bars. Filled symbols show the data of category A, while open symbols are of category B (Table 2). The observed d t ³⁻² values are explained quite well by KHOMC (red line). Superimposed are the individual station-based d t ³⁻² data converted to 500 km focal depth (large diamonds) (courtesy of A. Souriau). Smaller squares are other d t ³⁻² measurements made for individual stations taken from Souriau et al. (2003) without depth corrections. (c) Total residuals, defined as the square root of the squared sum of the residuals of d t ³⁻² for different outer core models. Filled portions are the misfits for the category A data alone. The colors used for the models correspond to those in (b)