Undersea Cables Are the Latest Tools for Earthquake Detection

These very words may have flown through an undersea cable before reaching your eyeballs. Hundreds of thousands of miles of fiber optics crisscross the world’s oceans, shuttling emails, Netflix shows, and news articles as packets of light. And, scientifically speaking, boy does that light have a story to tell—not so much about what happens on land, but what happens in the deep.

Writing last week in the journal Science, researchers described how they used a 3,600-mile cable stretching between Halifax, Canada, and Southport, in the United Kingdom, to detect storms, tides, and earthquakes. Because the cable lies on the seafloor, such perturbations

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