Bergen experienced a rare seismic event on Sunday when a fiber-optic cable detected ground movements from a distant earthquake. The quake’s epicenter was more than 300 kilometers away, yet the cable’s sensitivity allowed Norsar to record the tremors. This marks the latest demonstration of how everyday infrastructure can serve unexpected scientific purposes.
The earthquake originated near the Norwegian coast. Despite its distance from Bergen, the ground vibrations traveled through the Earth’s crust and were picked up by the cable. Norsar, a Norwegian research foundation specializing in seismic monitoring, confirmed the detection. The organization has been testing the method for years but this event provided a clear real-world example.
Fiber-optic cables are typically used for internet and telecommunications. However, their ability to sense environmental changes has expanded their role. When seismic waves pass through the ground, they slightly stretch or compress the cables. Specialized equipment at each end measures these tiny distortions, converting them into data about ground movement.
This technology offers a cost-effective alternative to traditional seismic sensors. Installing dedicated monitoring stations can be expensive. Fiber cables, already laid across cities and under oceans, provide a ready-made network. Norsar’s system uses existing cables without disrupting their primary function.
The Sunday quake was minor, with no reports of damage in Bergen. Still, the detection highlights how everyday tools can support scientific research. Norsar plans to expand testing to other regions, exploring the cables’ potential for early warning systems.
Source: tu.no