The cables detected a new fault system near the San Andreas Fault, which runs along the California coast.
Nearly 3,000 feet below the surface of Monterey Bay, a network of deep sea cables helps scientists to study marine life.
Last year, the researchers conducted a four-day experiment using 12 miles of the cable network to study the motion of the seafloor. The results of that experiment appear in a new paper in the journal Science published on November 28. To start, they attached a device to the end of the cables that shoots out bursts of light. When the ground moves, it places a strain on the cables that scatters the light and sends it hurtling back toward the device. These light waves can be measured to determine the magnitude of an earthquake.
Lindsey said the fault system is likely"much, much smaller" and"minor" compared to the San Andreas — which scientists have pinpointed as the likely source of the next major California earthquake. But he said his technology could ultimately be used to identify larger fault lines in unexplored areas like offshore Taiwan.
"In every case, it's limited scope in terms of the length of the experiment and it's high cost," Lindsey said. The MARS observatory, for instance, cost around $13.5 million.But Lindsey still thinks cable networks are the best way to study underwater seismic activity. Other ocean researchers share his enthusiasm.
On land, traditional earthquake sensors typically measure the speed of the ground motion at a single point. But fiber-optic cables allow researchers to take multiple measurements across a long path.
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