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Alaska Earthquake of 1964

Explore episode Jul 2, 2026
Science
A Tropical Fungus Spread by the 1964 Tsunami

Alaska Earthquake of 1964 · Jul 2, 2026 Science

Cryptococcus gattii, a tropical fungus that only grows on rotting wood, was introduced to Pacific Northwest waters via ship ballast from Brazil around 1900. The 1964 Alaska tsunami spread it inland, where it adapted for decades — by the 1990s it was causing mysterious fatal outbreaks that baffled epidemiologists.

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Landslide Tsunamis: Why Some Towns Were Hit in Minutes

At 25:05 · chapter starts 23:50

One of the earthquake's most puzzling aspects was the speed of local tsunamis. Standard tsunami models couldn't account for waves arriving at coastal towns within just 4 minutes of the quake — the physics simply didn't work. The explanation, when scientists finally found it, was hidden in Alaska's unique geography. The state's deeply carved fjords — ancient glacial channels — had over centuries deposited enormous quantities of silt onto the seafloor at their mouths. When the earthquake hit, it stirred all of that silt and sediment like sand in a shaken glass, triggering massive underwater landslides. These landslides, in turn, generated their own local tsunamis — arriving far faster than any wave from a distant epicentre could. A new scientific term was coined: the landslide tsunami. It's a phenomenon that now shapes how coastal communities everywhere think about post-earthquake safety, and it was identified here first.

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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