Skip to main content


Geophysicist and seismologist Inge Lehmann was born #OTD in 1888.

In 1936 she discovered the existence of a solid core at the center of the Earth, based on a careful analysis of global seismic records from a 1929 earthquake near New Zealand.

Image: Royal Danish Library
Sepia-tinted black and white photo of Inge Lehmann. She is looking directly at the camera, with a neutral expression.
#otd