Jeroen Tromp is best known for his recent work implying a heterogeneous cylindrical anisotropy model for this, though Creager has pointed to a substantial asymmetry in that model between the eastern and western hemispheres, especially in the first few hundred kilometers of this area.
Jeroen Tromp is best known for his recent work implying a heterogeneous cylindrical anisotropy model for this, though Creager has pointed to a substantial asymmetry in that model between the eastern and western hemispheres, especially in the first few hundred kilometers of this area. Song and Richards made the initial breakthrough studies on its super-rotation at the Alaskan COL station, and its bulk attenuation is the subject of some dispute. First proposed theoretically in 1936 by Inge Lehmann, who initially gave her name to its discontinuity, the incongruent freezing of this area and expulsion of impurities is likely responsible for powering the geodynamo. Composed of solid metal like nickel and iron, FTP, name this deepest distinct layer of the Earth.
Jeroen Tromp is best known for his recent work implying a heterogeneous cylindrical anisotropy model for this, though Creager has pointed to a substantial asymmetry in that model between the eastern and western hemispheres, especially in the first few hundred kilometers of this area.
{inner core} (prompt core, of course)