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Alaska Earthquake of 1964

Explore episode Jul 2, 2026
Science
Coastline changed up to 50 feet

Alaska Earthquake of 1964 · Jul 2, 2026

Geological surveys after the 1964 earthquake found that Alaska's coastline was altered by as much as 50 feet in some areas, with some parts rising 40 feet and others sinking up to 8 feet.

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How Far the Shaking Reached: Seiche Waves Around the World

At 9:40 · chapter starts 8:20

Once Chuck starts listing how far the earthquake's effects reached, the episode enters genuinely startling territory. Water level changes were registered in 47 of the 50 US states — every state except Connecticut, Rhode Island, and Delaware. These seiche waves, oscillating disturbances in enclosed or semi-enclosed bodies of water, were reported as far away as Australia and South Africa. In the Gulf of Mexico, the sloshing was so severe that fishing boats sank off Louisiana — thousands of miles from Alaska. The Space Needle in Seattle, roughly 1,000 miles from the epicentre, visibly swayed. Chuck and Josh spell out the word 'seiche' for listeners in alternating letters, a brief comic moment that underscores how unfamiliar the phenomenon is to most people — despite its extraordinary global reach in this instance.

Science
Alaska's Coastline Permanently Redrawn

Alaska Earthquake of 1964 · Jul 2, 2026 Science

The 1964 earthquake changed Alaska's coastline by up to 50 feet in some areas — some parts rose nearly 40 feet, others sank 8 feet. Shipping lanes had to be redrawn, entire forests dropped into the ocean still standing, and the land itself became unrecognizable.

Science
Entire Forests Dropped Upright Into the Ocean

Alaska Earthquake of 1964 · Jul 2, 2026 Science

Entire stretches of Alaskan coastal forest didn't fall over — they dropped vertically, still standing upright, straight into the ocean and were swallowed by the water. It's one of the earthquake's most haunting images, and it later gave scientists proof that this had happened many times before.

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