Stuff You Should Know

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Alaska Earthquake of 1964

Explore episode Jul 2, 2026
Science
Paleoseismology: A New Science Born from Disaster

Alaska Earthquake of 1964 · Jul 2, 2026 Science

Digging into the submerged forests of post-earthquake Alaska, geologists found layers of even older land plants buried beneath — proof that catastrophic subduction events had occurred repeatedly over millennia. This birthed the field of paleoseismology, which now lets scientists read the earthquake history of regions like the Pacific Northwest.

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How the Earthquake Proved Plate Tectonics

At 21:08 · chapter starts 19:35

It's startling to consider that plate tectonics — now one of the foundational pillars of Earth science — was still being actively contested as recently as 1964. Geologists had long noticed that continents appeared to fit together like puzzle pieces and that distant regions shared geological features, but the mechanism remained disputed. The Alaska earthquake changed that almost overnight. The sheer scale and character of the damage — the precise patterns of uplift and subsidence, the direction and magnitude of movement, the types of tsunamis produced — could only be satisfactorily explained by plate tectonics. Every alternative theory simply couldn't account for the evidence. Josh jokes that the main rival theory was divine will, and that plate tectonics just explains things better. It's a funny line with a serious point: this earthquake was the moment science stopped debating and started building on a solid foundation.

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