Fracking at the Preston New Road site in Lancashire has been suspended temporarily after a 1.55 magnitude quake was detected last night.
Most people who live near the site would not have sensed last night's movement, which the company say would have felt similar to someone dropping a large bag of shopping on the floor.
What is fracking?
Fracking involves drilling into the ground and pumping in water and chemicals to release gas. At the moment, it must be halted if tremors measuring 0.5ML on the Richter scale are detected - a threshold the company calls "uniquely low".
In a statement following last night's seismic activity, a spokesperson said:
We can confirm that a micro seismic event measuring 1.55ML (local magnitude) on the Richter scale occurred after we had completed the hydraulic fracturing programme for the day at our Preston New Road site. Most local people will not have felt it due to its small size. The equivalent ground motion would be similar to a large bag of shopping dropping to the floor. Well integrity has been verified and we will now pause operations and continue monitoring for the next 18 hours.
Cuadrilla recently announced it's pumped 16- million pounds directly into the Lancashire economy, through employing local people directly and working with local businesses and organisations.