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Alaska Earthquake of 1964

Explore episode Jul 2, 2026
Science
Landslide Tsunamis: A New Threat Discovered

Alaska Earthquake of 1964 · Jul 2, 2026 Science

Scientists couldn't explain why some coastal Alaskan towns were hit by tsunamis within just 4 minutes of the earthquake. The answer: Alaska's jagged fjord coastline had deposited centuries of silt on the ocean floor, and the quake triggered massive underwater landslides — a phenomenon now called a landslide tsunami.

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Paleoseismology: A New Science Born from Disaster

At 23:50 · chapter starts 21:10

With the science teams deployed and the dust settling, the USGS began making discoveries that would redefine earthquake science for generations. Digging into the silted, seawater-logged forests that had sunk into the ocean, researchers found something unexpected: beneath the 1964 disaster layer lay older, buried land plants. The subduction had happened before — not once, but likely many times over thousands of years. This single insight birthed an entirely new scientific field: paleoseismology, the study of prehistoric earthquakes through geological evidence. Josh paints the vision vividly, imagining time-lapsed forests sinking into the ocean and being replaced by new ones, over and over, like a geological conveyor belt with the Bugs Bunny Powerhouse song playing. The practical consequences were enormous: using these new techniques, scientists identified the Cascadia Subduction Zone — the fault that threatens California and the Pacific Northwest every moment of every day — a discovery that came directly from the science sparked by the 1964 Alaska earthquake.

Science
The Cascadia Subduction Zone Threat

Alaska Earthquake of 1964 · Jul 2, 2026 Science

The paleoseismology born from the 1964 Alaska earthquake directly led to our understanding of the Cascadia subduction zone — the fault that threatens the Pacific Northwest and California every single day. Without Alaska's earthquake, we might not know the Cascadia threat even exists.

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