In a striking revelation, a monumental megatsunami triggered by a landslide in Alaska has been classified as the second tallest ever recorded, highlighting the escalating dangers posed by climate change and melting glaciers. This alarming event unfolded in August 2025 when a staggering 64 million cubic metres of rock, roughly equivalent to 24 Great Pyramids, plummeted into the sea, generating a colossal wave that reached nearly 500 metres in height.
A Catastrophic Event Unveiled
The megatsunami struck the remote Tracy Arm Fjord in southeast Alaska, a region known for its dramatic cliffs and breathtaking icy landscapes. Although the incident occurred in the early hours of the morning, thus avoiding potential disaster for nearby tourist vessels, the aftermath was devastating. Geologist Dr Bretwood Higman, who surveyed the area shortly after, described it as “a close call,” noting the presence of tourists who could have easily been caught in the turmoil.
Dr Higman recounted the scene: “I found uprooted trees scattered across the mountainside, large debris hurled into the water, and extensive areas of stripped rock, devoid of soil and vegetation.” The implications of such a disaster are profound, as Alaska’s unique geography—with its steep mountains, narrow fjords, and frequent seismic activity—renders it particularly susceptible to megatsunamis.
Unprecedented Scale and Frequency
This latest phenomenon has drawn comparisons to the largest recorded megatsunami from the 1950s, which exceeded 500 metres in height. However, scientists are now increasingly concerned about the frequency of such events. Dr Stephen Hicks from University College London, who has spent decades researching tsunamis, expressed deep unease about the implications of climate change. “The melting glaciers are exacerbating these collapses significantly,” he warned.
The research team employed a combination of fieldwork, seismic measurements, and satellite imagery to reconstruct the series of events leading to the wave’s formation. Dr Hicks explained that the glacier had previously stabilised the rock formations. As the ice recedes, the underlying cliffs become exposed, leading to sudden and catastrophic collapses into the fjord below.
Rising Risks for Tourists
As remote areas of Alaska become popular destinations for tourists eager to witness the impacts of climate change firsthand, safety concerns are mounting. Dr Higman pointed out that while these regions attract visitors for their natural beauty, they are also fraught with danger. “More people are now venturing into these hazardous territories, often underestimating the risks involved,” he cautioned.
In response to the alarming findings, several cruise companies have announced plans to cease operations in Tracy Arm due to safety worries. The push for enhanced monitoring of Alaska’s vulnerable regions is becoming increasingly urgent, as experts predict that the likelihood of megatsunamis may increase tenfold compared to previous decades.
Why it Matters
The occurrence of this massive megatsunami serves as a critical wake-up call about the urgent need for climate action and hazard preparedness. As global temperatures rise and glaciers continue to melt, the risks of similar catastrophic events are likely to intensify. This incident not only underscores the fragility of our natural environments but also highlights the pressing need for comprehensive monitoring and proactive measures to safeguard both local communities and visiting tourists. In an era of rapid climate change, understanding and mitigating these risks is more crucial than ever.
