Draft:2025 Tracy Arm landslide and tsunami
2025 landslide and megatsunami in Alaska
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On August 10, 2025, a landslide, of a volume between 30 million and 290 million cubic meters occurred at the head of the Tracy Arm fjord, at the end of the South Sawyer Glacier. The landslide was recorded as a magnitude 5 seismic event, and triggered a megatsunami in the fjord at least 30 meters tall, with a runup between 470 and 500 meters.[1]
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|  |
.jpg) View of the landslide source (foreground) and runup (background) | |
| UTC time | 2025-08-10 13:26:43 |
|---|---|
| USGS-ANSS | ComCat |
| Local date | October 25, 2025 |
| Local time | 5:25:43 AKDT (UTC–08:00) |
| Magnitude | 5.4 Mww |
| Epicenter | 57.840°N 133.090°W |
| Type | Megatsunami |
| Areas affected | Tracy Arm, Alaska, United States |
| Tsunami | 470–500 m (1,540–1,640 ft) runup |
| Landslides | 100,000,000 m3 (3.5×109 ft3) |
| Casualties | None |
Landslide
At around 5:30 am local time on 10 August, 2025, more than 100 million cubic meters of rock detached from a slope on the northern shore of the head of the Tracy Arm fjord. Part of the landlide hit the tip of the South Sawyer Glacier, and another significant part fell into the fjord's waters. The event was registered as a magnitude 5 earthquake by seismometers, and was deemed as the biggest landslide in Alaska in over a decade.[1][2] The landslide was anticipated by multiple precursor events in the days prior, which were registered by seismic stations.
Tsunami
The landslide generated a megatsunami in the Tracy Arm. The tsunami's highest run-ups reached between 470 and 500 meters in height,
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