Researchers have made the ground shake in southern Switzerland, triggering thousands of tiny earthquakes in a monitored setting, as they seek to discover seismicity insights that could reduce risks.

“It was a success!” said Domenico Giardini, one of the lead researchers on the project, as he inspected a crack in the rock wall lining a narrow tunnel far below the Swiss Alps.

Wearing a fluorescent orange jumpsuit and helmet, the geology professor at the Federal Institute of Technology in Zurich (ETH Zurich) switched on his headlight to get a better look.

“We had seismicity,” he said excitedly, explaining that the goal was “to understand what happens at depth when the Earth moves”.

Giardini was standing in the BedrettoLab carved out in the middle of a narrow 5.2-kilometre (3.2-mile) ventilation tunnel leading to the Furka railway tunnel.

Reached by specially adapted electric vehicles that slide through the dank darkness along concrete slabs laid over a muddy dirt floor, the deep underground laboratory is the ideal location to create and study earthquakes, Giardini said.

“It is perfect, because we have a kilometre and a half of mountain on top of us... and we can look very close at the faults, how they move, when they move, and we can make them move ourselves,” he told AFP.

Typically, researchers seeking to study earthquakes place sensors near known faults and wait.