How one man mapped the ocean floor and changed our understanding of Earth

Nature · Published 3 October 2026 Swipe more like this →

In short: Maurice Doc Ewing was a titan of geophysics who transformed how we see the deep sea. From pioneering seismic studies to discovering the SOFAR channel, his relentless curiosity led him to lead over 50 expeditions. He fundamentally reshaped oceanography, leaving a legacy that spans from the abyss to the moon.

Born in 1906 in Lockney, Texas, Maurice Ewing rose from a farming background to become a central figure in 20th-century earth science. After earning his PhD from Rice University in 1931, he began a prolific career that saw him publish more than 340 scientific papers. His work at Lehigh University and later Columbia University established him as a master of seismic reflection and refraction, techniques he used to peer into the hidden structures of ocean basins.

In 1949, Ewing founded the Lamont Geological Observatory in Palisades, New York, where he assembled a brilliant team including Bruce Heezen and Marie Tharp. Together, they mapped the ocean floor, providing critical evidence for the theory of plate tectonics. Ewing's expertise was also sought by the government; he originated Project Mogul to detect nuclear tests and utilized deep-water photography to help locate ships lost to U-boats during wartime efforts. His discovery of the SOFAR channel—a layer of the ocean where sound travels over vast distances—remains a cornerstone of underwater acoustics.

Beyond his research, Ewing served as the head of major professional organizations, including the leading bodies for seismology and geophysics in the United States. His influence was recognized globally through numerous honors, such as the Gold Medal of the Royal Astronomical Society and the Vega Medal. Even after his death in 1974, his impact persists; his name graces a lunar ridge, research vessels, and prestigious scientific medals. His life’s work, from the fluidity of the Earth's core to the mechanics of ice ages, continues to define the modern study of our planet.

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