EMILIO SEGRE VISUAL ARCHIVES / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY EMILIO SEGRE VISUAL ARCHIVES / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY
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Inge Lehmann (1888-1993), Danish seismologist. Lehmann was educated at Copenhagen University, but did not receive her PhD until 1928, having pursued a career in insurance. From 1928 until retirement in 1953 she was chief of the seismological section of the Danish Geodetic Institute, responsible for the seismological stations in Greenland. Lehmann worked on earthquake data to study the Earth's internal structure. She discovered that the inner part of the liquid core was solid, and there is a distinct layer at a depth of 200 kilometres. Photograph, by the Peter Elfelt photographic studio, from the American Geophysical Union (AGU).
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