Land Magnetic Observations

Department of Terrestrial Magnetism Historic Monographs

Explore online versions of the historic Department of Terrestrial Magnetism (DTM) monographs in geomagnetism, atmospheric electricity, cosmic-ray studies, oceanography, and other areas of geophysics.

Historic Monographs

Adriana Kuehnel (right) works with Randy Kuehnel (middle) and Rod Green (left) to prepare seismometers to study the Kaapvaal Craton in South Africa circa 1997. Credit: Earth and Planets Laboratory

Our history

Learn about more than a century of history from the Department of Terrestrial Magnetism and Geophysical Lab, which merged in 2020 to become the Earth and Planets Laboratory. 

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