Massive Alaska megatsunami was second largest ever recorded
Summary
A massive megatsunami struck a fjord in southeast Alaska in August 2025 when a huge landslide caused by small earthquakes sent 64 million cubic meters of rock into the water. This wave, nearly 500 meters tall, is the second largest megatsunami ever recorded and scientists warn such events are becoming more frequent due to glacier melting linked to climate change.Key Facts
- The megatsunami occurred near South Sawyer Glacier in Alaska’s Tracy Arm Fjord.
- About 64 million cubic meters of rock (equal to 24 Great Pyramids) fell into the fjord in under a minute.
- The wave reached nearly 500 meters high, making it the second tallest megatsunami recorded after a 1958 event in Lituya Bay, Alaska.
- Small earthquakes triggered the landslide that caused the megatsunami.
- Melting glaciers weakened the cliffs by removing support, causing rock collapses to become more likely.
- Tracy Arm is popular with cruise ships, but the early morning timing likely prevented casualties.
- Scientists warn that megatsunamis are increasing in frequency, possibly up to 10 times more than decades ago.
- Researchers call for better monitoring of landslide risks in areas vulnerable to megatsunamis in Alaska.
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