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Alaska’s Denali National Park is experiencing unprecedented glacier melt, with recent events underscoring the urgent need to address climate change. A groundbreaking study has revealed that a mega tsunami triggered by a rockslide in the Tracy Arm fjord last year serves as a stark reminder of the dangers posed by retreating glaciers and the rising threat of natural disasters linked to our warming planet.
A Record-Setting Tsunami
In August 2025, the world bore witness to the second-highest tsunami ever recorded, reaching a staggering height of 481 metres (1,578 feet) following a rockslide at the base of a glacier in southeast Alaska. This colossal wave struck after a landslide occurred at 5:26 AM local time on 10 August, as a massive mass of earth fell 1 kilometre down onto the South Sawyer glacier and into the narrow fjord below.
Dan Shugar, a geomorphologist from the University of Calgary, led the research published in *Science*, which highlights the potential for similar incidents as climate change continues to reshape our world. With the Eiffel Tower standing at just 330 metres (1,082 feet), the Tracy Arm tsunami is a vivid illustration of the frightening forces at play in our increasingly unstable environment.
A Close Call for Tourists
Fortunately, no casualties were reported during this monumental event, but the implications are dire. The fjord, frequently visited by cruise ships, had several vessels scheduled to enter the area shortly after the landslide occurred. Just hours after the tsunami struck, a sightseeing boat from Juneau and a National Geographic tour vessel, each capable of carrying over 100 passengers, were poised to navigate the same waters. The day prior, two cruise ships carrying thousands of tourists had already traversed the fjord, and another was set to arrive the following day.
Dennis Staley from the US Geological Survey remarked on the significance of the tsunami, labelling it “a historic event” and expressing relief that a disaster had been narrowly averted. He noted, “I feel like we dodged a bullet.” As more cruise ships venture into fjord regions, the risks associated with landslides and tsunamis are only increasing, necessitating immediate attention and action.
The Role of Climate Change
Research findings indicate that climate change is playing a critical role in the frequency and severity of such natural disasters. The study details how the retreat of glaciers, exacerbated by rising temperatures, likely contributed to the landslide that generated the tsunami. Without the rapid melting of glacier ice, the catastrophic rockslide may not have occurred at all.
Eyewitness accounts further illustrate the tsunami’s impact. Kayakers camping on Harbour Island, located approximately 55 kilometres away, reported water surging past their tent, resulting in the loss of one kayak and other equipment. Another observer, situated about 50 kilometres from the landslide, witnessed waves cresting at heights of 2 to 2.5 metres, followed by additional surges.
The researchers concluded that landslide-generated tsunamis can produce significantly higher wave runups compared to those triggered by earthquakes. This phenomenon is particularly pronounced in confined bodies of water like fjords, where localized water depth variations amplify the effects of slope failures.
A Call for Action
As the climate crisis accelerates, the risks associated with glacier retreat and permafrost degradation continue to mount. The study highlights the alarming trend of increasing annual cruise passenger numbers in Alaska, which have surged from approximately 1 million in 2016 to 1.6 million in 2025.
In light of these findings, researchers advocate for stronger risk mitigation strategies, including the systematic monitoring of unstable slopes, refined tsunami modelling scenarios, and enhanced protections for local communities and tourists.
Why it Matters
The implications of this research extend far beyond the shores of Alaska. As climate change continues to reshape our planet, the escalating risks of natural disasters highlight the urgent need for comprehensive climate action. The tragic reality is that without proactive measures to combat climate change, we could face more frequent and severe phenomena like the Tracy Arm tsunami, endangering lives, wildlife, and the fragile ecosystems that define our world. The time to act is now; the stakes have never been higher.
