Rumbles and tides create tiny, detectable disturbances in fiber optics. The world’s cables could form a vast network for detecting earthquakes and tsunamis.
.) In the map below, those are indicated with yellow dots. “Every 60 to 80 kilometers, usually, you need an optical amplifier, which essentially takes the incoming light and amplifies it,” says Giuseppe Marra, a metrologist at the UK’s National Physical Laboratory and lead author of the new paper. “So they propagate through the next span, and then there is another amplifier, and you keep going like this to get to the other side.
The graph below shows an earthquake detected along three spans in the middle of the Atlantic. Notice how the signal hits at slightly different times. With that data, the researchers could triangulate the source—an earthquake in Peru—which they confirmed with seismic data that other scientists had collected. As that graph shows, the seismic waves hit S5 first—the span closest to Peru—then S4 and finally S3.
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