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Scientists discover tectonic fault zone through undersea fiber-optic cables

The vast network of cables on the ocean floor can potentially be used to monitor global seismic activity….The latest development in this scientific research comes from the US, where scientists from the University of California, Lawrence Berkeley National Laboratory, Monterey Bay Aquarium Research Institute and Rice University, studied a 20 km long undersea fiber-optic cable for four days and recorded a 3.4 magnitude earthquake from a tectonic fault zone in Monterey Bay, along the Californian coast. They found that any disturbance or movement in the cable scattered and distorted the light signal used for transmitting data in fiber-optic technology. Observing this "backscatter" phenomenon through a technique called Distributed Acoustic Sensing (DAS), the 20 km long cable was turned into a bed of 10,000 motion sensors that could detect seismic activity with picometer precision.
Scientists discover tectonic fault zone through undersea fiber-optic cables
Techspot November 29, 2019
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