Stuff You Should Know

Podbit · Stuff You Should Know

Alaska Earthquake of 1964

Explore episode Jul 2, 2026
Science
How Megathrust Earthquakes Work

Alaska Earthquake of 1964 · Jul 2, 2026 Science

All 10 of the 10 largest earthquakes ever recorded are megathrust earthquakes — and now we know why. Two tectonic plates collide, lock together under immense pressure, and eventually one gives way in a catastrophic slip, lurching an entire region of the Earth's surface dozens of feet in seconds.

Where this was said

The Good Friday Earthquake: Scale and Overview

At 3:55 · chapter starts 2:10

With the personal anecdotes out of the way, Chuck and Josh get down to the facts. The Good Friday Earthquake struck Alaska on March 27, 1964, registering 9.2 on the Richter scale — second only to Chile's 9.5 in 1960. Despite the colossal force, total deaths numbered 131, which Chuck contextualises as relatively low given that only about 15 people were killed by the earthquake itself; most fatalities came from the tsunamis that followed. Josh makes an argument that runs through the whole episode: this earthquake didn't just destroy — it transformed science. It happened at precisely the moment when the scientific community had the tools and motivation to study it, and what they learned rewrote everything we thought we knew about seismology, tsunamis, and plate tectonics.

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