Episodes 2001; 24(4): 262-267
Published online December 1, 2001
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"We take it that, as before, the Earth consists of a core and a mantle, but that inside the core there is an inner core in which the velocity is larger than in the outer one." — Lehmann (1936).
In 1936, the Danish seismologist Inge Lehmann (1888–1993), who worked for the Danish Geodetic Institute from 1925 to 1952, suggested from the analysis of P-wave data that the Earth must have an inner core — an important breakthrough in the understanding of the nature of the Earth's interior