How A Megatsunami Explained Weird Earth Tremors

NASA SWOT data unlocked the mystery.

View in Browser  DIGITAL ISSUES GEAR REVIEWS SUBSCRIBE The Story We Can't Stop Thinking About  That time the planet rang like a bell. In 2023, Earth started pulsing every 90 seconds—and for nine straight days, it just kept going. Seismometers all around the world picked up the weird signal and traced it back to a fjord in Greenland, where a landslide that was triggered by a megatsunami set water sloshing back and forth in a trapped standing wave. (Nature is crazy.) For a while, scientists couldn't prove it, until a next-gen NASA satellite gave them their answer. —Andrew Daniels, Director of News A Mountain Secretly Collapsed in Greenland. And Then the Earth Rang Like a Bell Scientists traced the mysterious global vibration back to a single, 650-foot wave violently trapped inside a remote waterway. Read More Archaeologists Uncovered a Rare Medieval Ring—With Mystical Implications The ring, made in part from deep-blue stone, was likely owned by a high-status woman during the Middle Ages. Read More Best Cordless Drills I put several models through their paces in my workshop. Here's my take on each. Read More Sinkholes Are More Frequent and More Dangerous Now Sinkholes are on the rise worldwide—especially in urban areas—due to climate change and aging infrastructure. Read More Engineers Discovered the Spectacular Secret to Making 17x Stronger Cement The breakthrough could lead to more durable—and drastically safer—buildings. Read More Scientists Tracked Particles Floating Through the Air—And Solved a 100-Year-Old Mystery Accurately modeling irregularly-shaped particles isn't easy, but a new study found a way to improve a century-old idea. Read More Need Assistance? Contact Us. Follow Us Unsubscribe | Manage Preferences | Privacy Notice | CA Notice at Collection Popular Mechanics is a publication of Hearst Magazines. ©2026 Hearst Magazine Media, Inc. All Rights Reserved. This email was sent by Hearst Magazines, 300 West 57th Street, New York, NY 10019-3779