Figure 1: Extent of the LLSVPs in the lowermost mantle.
From: Density structure of Earth’s lowermost mantle from Stoneley mode splitting observations
(a) The extent of the LLSVPs (‘LL’ region) is indicated for the -0.10% velocity contour of SP12RTS (ref. 27), the −1.0% velocity contour of SMEAN66 and the slow lower mantle cluster2, drawn over the shear-wave velocity structure of SP12RTS at 2,850 km depth. All definitions result in a similar lateral extent. (b) Schematic overview of the ‘LL’ (red) and ‘SR’ (blue) regions in the lowermost mantle used in this study. Density structure is described by scaling factors RLL and RSR in the two regions. A scaling of R=0.3 is used in the remaining areas (white), resulting in small density variations of <0.15%.
