The same fiber optic networks that provide internet and television can simultaneously act as earthquake sensors, according to a new study from Caltech researchers.
Thousands of miles of fiber-optic cables, already in place across California, can shake up the study of earthquakes.used a section of telecommunication fiber to sense and measure a magnitude 6 earthquake, repurposing the assemblies to extract sharper details about the temblor.
“If we can get broader coverage to measure seismic activity, we can revolutionize how we study earthquakes and provide more advance warning,” Zhan said. “Though we cannot predict earthquakes, distributed acoustic sensing will lead to a better understanding of the details underlying how the earth ruptures.”
Researchers said that section of cable acted like 10,000 seismometers and was able to provide detailed characteristics of the tremor. For example, it showed the 2021 earthquake was made up of a sequence of four smaller sub-events or ruptures, mini-quakes that could not be detected by a conventional seismic network.
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