A 1,578-foot tsunami struck a popular Alaskan cruise destination. Now we know why.
Get the Popular Science daily newsletter💡 Breakthroughs, discoveries, and DIY tips sent six days a week. If you’re one of the roughly 1.6 million who took a cruise in Alaska last year, chances are you sailed through the Tracy Arm fjord. The picturesque, narrow fjord is a popular sightseeing area and is part of the Tongass National Forest, about 40 to 50 miles south of the capital city of Juneau. In the early hours of August 10, 2025, an enormous landslide triggered a massive tsunami down the fjord. The tsunami was 1,578-feet-tall, or one-and-a-half times the height of the Eiffel Tower. Fortunately, no one was caught in the wave since it hit around 5:30 a.m. local time. If the tsunami hit later that day, about 20 cruise ships and numerous recreational boaters and kayakers could have been impacted by the giant wave. In a study published today in the journal Science, researchers studied this “near miss” event, finding that the continued effects of climate change were likely the cause. The team studied several eyewitness stories …








