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Dark fiber: Using sensors beneath our feet to tell us about earthquakes, water, and other geophysical activity

(DOE/Lawrence Berkeley National Laboratory) Scientists at the Department of Energy's Lawrence Berkeley National Laboratory have shown for the first time that dark fiber -- the vast network of unused fiber-optic cables installed throughout the country and the world -- can be used as sensors for detecting earthquakes, the presence of groundwater, changes in permafrost conditions, and a variety of other subsurface activity.
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