Cuadrilla temporarily halted fracking at its site in Lancashire after a “tiny” tremor was felt, the energy company has said.
The company said that an “extremely low level” of seismic activity was detected on Tuesday afternoon at the shale exploration site at Preston New Road.
The tremor could not be felt on the surface but the company has said it had “adopted extra caution” and had stopped pumping for the day.
Fracking is set to resume on Wednesday morning, the company said.
'Local residents should be reassured'
Protesters outside the fracking site in Lancashire earlier this month. Image: OLI SCARFF/AFP/Getty Images
Cuadrilla has reassured local residents that all monitoring systems were in place and that these were "tiny seismic events".
In a statement, Cuadrilla said: "Seismicity will, as always, continue to be monitored closely around the clock by ourselves and others and we plan to continue hydraulic fracturing again in the morning.
"Local residents should be reassured that the monitoring systems in place are working as they should.
"These are tiny seismic events that are being detected by our monitors as we fracture the shale rock and are not capable of being felt, much less cause damage or harm."
The fracking site has been at the centre of controversy as activists from campaign group Reclaim the Power protested at the site earlier in the month.
The group attempted to block the entrance of the site at Preston New Road with a van, whilst protesters lacked themselves to the scaffold.
The work at Preston New Road is the first fracking in the UK for seven years, after work by Cuadrilla was halted in 2011 following two tremors near Blackpool.