African Continent Evolution research using ultra-detailed Landsat and Seismic Tomography from surface to 2,900 km depth. (Part 9) African continent tomography at 400 km depth. 3 February 2021 by Robert Watchorn African Continent Evolution research using ultra-detailed Seismic Tomography from 400 km depth. Implications for Plate Tectonics, continent formation and the genesis and targeting of mineralisation. Like it? Share it!