Massive Alaska megatsunami was second largest ever recorded
Researchers say glacier retreat destabilized the slope, and the 64 million-cubic-meter collapse sent a nearly 500-meter wave through the fjord.
- On Wednesday, researchers led by University of Calgary geomorphologist Daniel Shugar published a study in the journal Science reconstructing a mega-tsunami triggered by a massive landslide into Alaska's Tracy Arm Fjord on August 10, 2025.
- Rapid warming caused the South Sawyer Glacier to retreat about 500 metres, destabilizing the mountainside and unbuttressing 370 million metric tons of rock that collapsed into the fjord.
- The resulting wave reached about 481 metres, the second-highest run-up ever recorded, as debris fell 1,000 vertical metres into the deep, narrow fjord.
- Cruise lines have suspended routes into the fjord this year, while Shugar described the event as a "good wake up call" given the fortunate absence of vessels near the slide.
- Experts warn that continued glacier retreat and expanding tourism infrastructure increase the likelihood of future disasters, necessitating better slope monitoring and proactive policymaking to mitigate risks.
102 Articles
102 Articles
Tsunamis due to the retreat of glaciers due to climate change could become an increasingly frequent threat in polar and subpolar regions of the planet. A new scientific study alerts that accelerated melting is increasing the risk of gigantic landslides capable of generating extreme waves, such as the one recorded in Alaska during the summer of 2025. The research analyzes the collapse in the Tracy Arm fjord in southeastern Alaska, where a huge ro…
In a remote fjord in Alaska, a tsunami wave of up to 481 metres high was formed last summer – triggered by a massive mountain fall that ripped millions of cubic metres of rock into the water. According to researchers, the fact that no cruise ships and possibly hundreds of people were affected was due to pure happiness – and only to the time of the event. The new scientific study, published in the journal "Science", draws a detailed picture of th…
By Ella Nilsen and Sam Hart, CNN. In August 2025, the second-highest tsunami wave ever recorded in the world swept through the remote Tracy Arm fjord in Alaska, leaving immense destruction in its wake. Luckily, no one was nearby. But in the aftermath, scientists immediately set to work reconstructing what happens when a mountainside collapse triggers a mega-tsunami and no one is around to witness it. Here's how it happened: On August 10, at 5:30…
Alaska Beacon
kiowacountypress.netMegatsunami in Alaska’s Tracy Arm was the second-highest ever measured
500 meters high from the fjords Tracy Arm in USA - populär bland tourism på kryssningsfartyg - orsakad av bergras
Algemeen Dagblad
Last year, a megatsunami raged through the Tracy Arm fjord in the American state of Alaska. According to calculations by researchers, the tidal wave reached a height of no less than 481 meters. Because the tsunami occurred early in the morning, there were no cruise ships in Tracy Arm yet, and there were no casualties.
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