Published：May 6, 12:00Last updated：May 7, 09:47

Alaska's 500m Mega Tsunami Warning

May. 6, 2026 12:00

A 481-meter mega tsunami in Alaska’s Tracy Arm fjord, triggered by a rockslide linked to glacier retreat, serves as a warning of coastal risks fueled by the climate crisis. The tsunami, the second tallest ever recorded, occurred in an area frequented by cruise ships. Researchers emphasize the dangers posed by glacier retreat and rockslides.

Summarized

10News

9Media

May. 7, 2026 08:06

Researchers confirmed that a landslide-induced tsunami in Alaska in August 2025 reached nearly 500 meters in height, making it the second-largest tsunami ever recorded. The event occurred in Tracy Arm Fjord, where 64 million cubic meters of rock fell into the water. No casualties were reported, but experts warn of increasing risks due to climate change and glacier retreat.

May. 7, 2026 09:47

Aerial photos show the landslide that occurred on August 10, 2025, in Tracy Arm, Alaska, as part of a reconnaissance survey by the U.S. Geological Survey.

A catastrophic 500-meter tsunami, the second tallest ever recorded, struck Alaska's Tracy Arm Fjord in August 2025 after a massive rockslide linked to glacier retreat. The event, which released 64 million cubic meters of rock near South Sawyer Glacier, highlights growing climate change risks in vulnerable coastal regions. Researchers confirmed the incident through aerial surveys and geological analysis, though no casualties were reported in the remote area. The Guardian+2

🌊 Unprecedented Wave Formation

The tsunami reached 1,578 feet (480m) in height, dwarfing most recorded waves. It originated when melting permafrost destabilized a slope in the Tongass National Forest, causing a rapid collapse into the fjord. Unlike earthquake-triggered tsunamis, this event was localized but exceptionally powerful due to the sheer volume of displaced water. Der Spiegel+2

❄️ Glacier Retreat Connection

Scientists from the U.S. Geological Survey identified climate change as the primary driver, with retreating glaciers removing support for adjacent rock faces. South Sawyer Glacier has receded over 1.5 miles since 2005, exposing unstable terrain. Similar risks exist in over 20 Alaskan fjords with comparable geology. China.org+2

🚢 Cruise Ship Danger Zone

Tracy Arm Fjord is a popular tourist destination, with cruise ships frequently visiting during summer months. The 2025 event occurred in a narrow channel where vessels often navigate, raising concerns about future disaster preparedness. No ships were present during the landslide due to seasonal timing. The Guardian+2

📊 Climate Risk Projections

Researchers created a timeline of key events:

Year	Event
2005	South Sawyer Glacier begins rapid retreat
2023	First major rockfall detected
Aug 2025	Catastrophic landslide triggers megatsunami
2026	Risk assessment published
The study warns that 10+ Alaskan fjords could experience similar collapses by 2040 if warming trends continue. China.org+2

Tracy Arm FjordSouth Sawyer GlacierU.S. Geological SurveyTongass National Forest

topic.regionalNarratives

United Kingdom

Reporting emphasizes the scale and record-breaking nature of the tsunami, alongside its implications for coastal tourism and climate-linked geological risks.

Germany

Coverage focuses on the scientific reconstruction of the event and its direct correlation with climate-induced geological instability.

United States

Discussion centers on the predictive aspects of future tsunamis linked to environmental changes and glacier retreat.

China

Outlets frame the event around quantitative measurements of the landslide and tsunami, with explicit ties to climate change exacerbating geological vulnerabilities.