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She worked on the problem of determining the travel times of seismic waves over distances, a task that was difficult early in her career due in part to the poor distribution of seismic stations in Europe; she preferred to analyze seismograms from different stations herself to make interpretations more consistent, as different seismologists might read different wave arrivals, making correlation more difficult.
Through careful analysis of earthquake records, she argued in a paper that certain anomalous seismic waves had been reflected off a discontinuity in the core; this is now known to be the boundary between the liquid outer core and the solid inner core.
Later in her career, especially in the s, Lehmann studied the propagation of different kinds of surface and body waves, some of which had been difficult to resolve in seismic records. In the early s, a number of countries began to improve and standardize their seismographs in large part for surveillance of underground nuclear testing.
This allowed seismic records, which before were generally made by non-standardized equipment, to be compared far more easily across the world, and drove much of her last decade of research, which largely focused on the structure of the upper mantle and the analysis of seismic waves from nuclear explosions. Image: Photo of Inge Lehmann, date unknown, by B.
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Discontinuïtat de Lehmann
PARTES DE LA TIERRA