Fig. 4: Vertical cross-sections through our impedance image centered at Mauna Loa (see map).
From: Seismic evidence for a 1000 km mantle discontinuity under the Pacific

From top to bottom: the West-East, North-South, Southwest-Northeast, and Northwest-Southeast sections. The mid-mantle discontinuity inferred from this image is shown by the green lines. See Fig. 3 for the profile aligned with the Hawaiian-Emperor seamount chain.