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- Johann von Lamont (Scottish, 1805–1879) – Surveys of the Earth's magnetic field
- Inge Lehmann (Danish, 1888–1993) – seismologist who discovered the Lehmann discontinuity and argued for a solid inner core
- Xavier Le Pichon (French, 1937–) – Constructed history of plate motions
- Augustus Edward Hough Love (English, 1863–1940) – Developed theory of Love waves
Read more about this topic: List Of Geophysicists