Fibre optic cables designed to carry telecommunications can also be used to map Earth’s interior Connect world/Shutterstock
Offline telecom cables called 鈥渄ark fibres鈥 can be used to sense underground seismic waves. Geophysicists are increasingly using such signals to study aspects of Earth鈥檚 subsurface, including hidden sources of geothermal energy and earthquake hazards.
鈥淚f a large earthquake happens on the fibre on which we are speaking, the frequencies in my voice would be slightly distorted,鈥 at ETH Zurich in Switzerland told New 女生小视频 on a video call.
He is referring to how earthquakes or even mild ambient seismic…
