# Alaska : un glissement de terrain a provoqué un mégatsunami de près de 500 mètres de haut

Page: https://stenobird.com/podcast/les-matins-de-france-culture-1387120/alaska-un-glissement-de-terrain-a-provoqu-un-m-gatsunami-de-pr-s-de-500-m-tres-de-haut
Text version: https://stenobird.com/podcast/les-matins-de-france-culture-1387120/alaska-un-glissement-de-terrain-a-provoqu-un-m-gatsunami-de-pr-s-de-500-m-tres-de-haut.md
Podcast: [Les Matins de France Culture](https://stenobird.com/podcast/les-matins-de-france-culture-1387120)
Published: 2026-05-07T05:41:00+00:00
Episode link: https://www.radiofrance.fr/franceculture/podcasts/la-revue-de-presse-internationale/la-revue-de-presse-internationale-emission-du-jeudi-07-mai-2026-1645567
Audio file: https://proxycast.radiofrance.fr/0b568f76-2cb9-46a6-b6cc-394882637fbd/10075-07.05.2026-ITEMA_24503144-2026C22811S0127-NET_MFC_1DED7452-E47B-4901-A6F7-FB9E47EE4FED-21-45bf42ae02329a90c042b90af0f07368.mp3
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Duration seconds: 334

## Resource

A massive landslide in Alaska's Tracy Arm fjord triggered a 500-meter megatsunami, the second largest ever recorded. Scientists warn that accelerating glacier melt and climate change are increasing the frequency of such catastrophic geological events.

## Highlights
- Main idea: A rockfall equivalent to 24 pyramids created a wave taller than the Eiffel Tower
- Scientific insight: The event generated seismic vibrations powerful enough to shake the entire planet for days
- Practical takeaway: Cruise lines are already suspending trips to Tracy Arm due to increased landslide risks
- Failure mode: Rapid glacier melting destabilizes mountain flanks, making massive landslides more probable
- Global context: Rising Pacific sea temperatures are signaling the potential arrival of a super El Niño

## Topics

Alaska, Megatsunami, Climate Change, Glacier Melt, Geology, El Niño, Natural Disasters, Oceanography

## Chapters
- 0:00 — The Alaska Megatsunami: An overview of the massive 500-meter wave triggered by glacier melt and its impact on the Tracy Arm fjord.
- 0:50 — The Mechanics of the Collapse: Details on the massive rockfall from a 900-meter cliff and the sheer volume of the displacement.
- 1:40 — Global Seismic Impact: How the energy from the wave caused planetary-scale vibrations, similar to recent events in Greenland.
- 2:10 — Visualizing the Disaster: How researchers are using hydrodynamic video game modeling to help the public grasp the scale of the wave.
- 3:00 — Climate Risks and Tourism: The direct link between human-driven climate change and the vulnerability of Alaskan cruise routes.
- 3:50 — Global Climate Anomalies: Rising sea temperatures in the Pacific and the broader implications for extreme weather worldwide.
- 5:00 — The Super El Niño Threat: Analyzing how recent typhoons and ocean temperature spikes signal a powerful upcoming El Niño cycle.

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## Transcript

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