Figure 5.
Schematic 3-D block diagram of upper mantle flow in the vicinity of the slab window delineated by the travel time inversions (Fig. 3); view from SW. Top map shows relief and locations of Chile Ridge structures before and after subduction. Bottom shows coastline and Chile Ridge structures over color-coded slab plates: Nazca plate—yellow; Antarctic plate—blue-green; same colors for portions of the slab visible in the block diagram itself. Red arrow generally parallels shear-wave splitting fast trends and upper mantle flow in the vicinity of the slab window opening. The northern, shallower portion of the slab window is not visible from this viewpoint.