Watch: Recreating the second-tallest tsunami on record
Watch: Recreating the second-tallest tsunami on record
The sheer power of nature was on full display in August 2025 when a massive rockslide in Alaska's Tracy Arm Fjord triggered a megatsunami that reached a staggering height of 481 meters. As researchers from the University of Calgary and other international institutions delve into the data, the scientific community is hard at work recreating this hazards cascade to better understand the risks posed by melting glaciers and unstable mountainsides. This historic event, which was nearly twice the height of the Eiffel Tower, serves as a chilling reminder of how climate change is reshaping our landscapes and creating new, unpredictable dangers for coastal regions and the tourism industry.
The second-tallest tsunami on record occurred on August 10, 2025, in Tracy Arm Fjord, Alaska, after approximately 64 million cubic meters of rock collapsed into the water following the retreat of the South Sawyer Glacier. Reaching a run-up height of 481 meters (1,578 feet), this megatsunami is surpassed only by the 1958 Lituya Bay event. Scientists are now using digital elevation models and advanced numerical simulations to recreate the wave's path and its unique seismic ringing effect, which vibrated across the globe for over 36 hours.
The Science Behind the Tracy Arm Megatsunami
Understanding how a wave can reach nearly 500 meters in height requires a deep dive into the physics of landslide-generated tsunamis. In the case of Tracy Arm, the mechanics were a perfect storm of geological instability and narrow fjord geometry. When the South Sawyer Glacier retreated by approximately 500 meters due to rapid warming, it removed the physical support—the buttress—that had held the surrounding mountainside in place for centuries. On that fateful morning at 5:30 a.m., over 370 million metric tons of rock plummeted 1,000 vertical meters into the deep, narrow waters of the fjord. The displacement was instantaneous and violent, forcing the water upward with such velocity that it crested far above the surrounding tree lines.
Comparing Tracy Arm to the 1958 Lituya Bay Event
For decades, the 1958 Lituya Bay tsunami stood as a singular anomaly in modern history, with its 524-meter run-up height. The Tracy Arm event of 2025 now sits firmly as the "silver medalist" of terrifying aquatic phenomena. While both were triggered by landslides in Alaskan fjords, the 1958 event was initiated by a massive magnitude 7.8 earthquake. In contrast, the Tracy Arm landslide was a direct consequence of long-term glacial thinning and retreat. Scientists noted that while the peak height in Lituya Bay was higher, the Tracy Arm event produced a more complex seismic signature, described as a "ringing" that lasted for days, suggesting that the energy trapped within the fjord's steep walls behaved differently than previously observed models.
The Role of Climate Change in Destabilizing Fjords
The retreat of glaciers is often discussed in terms of rising sea levels, but the Tracy Arm megatsunami highlights a more immediate and localized hazard: slope destabilization. As ice melts, the pressure it exerts on valley walls disappears, leaving behind steep, fractured rock faces that are prone to collapse. Researchers led by Dan Shugar have emphasized that "without the rapid glacier retreat, the landslide would likely not have resulted in such a wave." This event is part of a growing trend of cascading hazards where a primary climate driver leads to a secondary geological disaster, which then results in a tertiary hydrological catastrophe.
Recreating the Disaster with Advanced Simulation Models
To prepare for future events, engineers and geomorphologists are turning to virtual recreations. Using "shallow water" numerical models and vertically integrated Savage-Hutter simulations, researchers can input the specific volume of the rockfall and the bathymetry of the fjord to see how the energy propagates. Interestingly, scientists have even utilized video game technology to create immersive environments where observers can "ride" a jet ski through the recreation of the wave. This isn't just for spectacle; it helps planners and emergency responders grasp the true scale of the destruction, from the way forests are stripped to bare rock to how boulders are hurled kilometers away from the impact site.
| Column 1 | Column 2 |
|---|---|
| Event Date | August 10, 2025 |
| Max Run-up Height | 481 Meters (1,578 Feet) |
| Rockfall Volume | ~64 Million Cubic Meters |
| Primary Cause | Glacial Retreat/Landslide |
Seismic Ringing: A Global Signal from a Local Event
One of the most fascinating discoveries from the 2025 event was the detection of long-period seismic waves by sensors around the world. The energy from the tsunami became "trapped" within the Tracy Arm fjord, creating a seiche—a standing wave that oscillated back and forth for 36 hours. This produced a distinct seismic hum that allowed geologists to identify the event even before visual confirmation arrived from satellite imagery. Recreating these vibrations in a laboratory setting allows scientists to distinguish between standard tectonic earthquakes and landslide-generated signals, potentially leading to earlier warning systems for remote regions.
The Impact on Alaska's Tourism and Cruise Industry
Tracy Arm is a premier destination for cruise ships, known for its stunning icebergs and wildlife. The 2025 megatsunami occurred just hours after two large vessels had departed and shortly before another was scheduled to arrive. This "near-miss" has sent shockwaves through the tourism industry, leading to temporary suspensions of routes and calls for more rigorous monitoring of slopes along popular cruise corridors. Recreations of the event show that any ship within the fjord during the impact would have faced catastrophic conditions, regardless of its size, as the wave moved with speeds estimated between 100 and 130 miles per hour.
Future Hazards: Predicting the Next Mega-Wave
With the frequency of these landslide-tsunamis increasing—from once every 20 years to six events in the last decade—scientists are racing to map other "at-risk" slopes. Areas with receding glaciers like Kenai Fjords and Taan Fjord are under intense scrutiny. By recreating these events digitally, researchers can identify specific markers of instability, such as micro-cracks or shifting soil, that precede a total collapse. The goal is to move from reactive "detective work" to proactive hazard mitigation, ensuring that the growing number of visitors to the Arctic and Sub-Arctic are kept out of harm's way.
Lessons Learned for Global Coastal Communities
While the Tracy Arm event was contained within a fjord, the lessons learned apply globally. From the fjords of Norway to the steep coasts of the Pacific Northwest, the combination of melting ice and unstable terrain is a universal threat. The recreations show that the force of these waves can clear land up to 200 meters in altitude even kilometers away from the source. This necessitates a rethink of coastal infrastructure and emergency response training. As Dan Shugar noted, it's not just about building stronger structures; it's about training people to understand the signs of a hazard cascade and react before the wave hits.
Frequently Asked Questions
What is the tallest tsunami ever recorded?
The tallest ever recorded was the 1958 Lituya Bay tsunami in Alaska, which reached a run-up height of 524 meters (1,719 feet).
How did scientists measure the height of the Tracy Arm wave?
Scientists used the "trimline"—the distinct line on the mountainside where all vegetation and soil were stripped away—combined with satellite imagery and digital elevation models.
Could a ship survive a megatsunami?
It is highly unlikely. Recreations show that the force and speed of the wave, combined with the debris it carries, would likely capsize or destroy even large modern vessels in a confined fjord.
Is Tracy Arm still dangerous?
While the immediate slide has settled, the region remains geologically active. Continued glacial retreat means other slopes could become unstable, and researchers are actively monitoring the area.
Why are these waves called "megatsunamis"?
The term "megatsunami" is used for waves that reach hundreds of meters in height, typically caused by massive landslides or impacts rather than underwater tectonic shifts.
Conclusion
The recreation of the Tracy Arm megatsunami is more than just a scientific exercise; it is a vital tool for understanding a new era of natural disasters. As our planet warms and glaciers continue their inevitable retreat, the stability of our fjords and coastlines will remain in flux. The data gathered from the August 2025 event—from the 481-meter run-up to the 36-hour seismic ringing—provides a blueprint for detecting and surviving future hazard cascades. By combining field research with advanced digital simulations, we can hope to turn these terrifying "near-misses" into opportunities for better preparedness and global awareness of our changing Earth.
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