Under U.K. rules, any tremor over 0.5 is classed as a "red event" and sparks a temporary shutdown while monitoring continues.
A spokesman for the the Oil and Gas Authority said: "While the operations at the Preston New Road site have been created to minimise any disturbance, minor events like these were expected".
Under the "traffic light" system, the company must stop fracking for 18 hours after a tremor with a magnitude of more than 0.5, although those below 1.5 can not be felt at the surface.
"All the relevant regulators were informed without delay and we have verified that the well integrity is intact", Cuadrilla said.
A Cuadrilla spokeswoman said that, as the operations had finished before the detection, "This is not an "red" incident under the traffic light system operated by the Oil and Gas Authority as we were not pumping fracturing fluid as part of our hydraulic fracturing operations at the time".
"The British Geological Survey (BGS) records seismicity to one decimal place and therefore have recorded the event as 0.8ML (local magnitude)". Environmental activists failed in early October in Britain's High Court to keep fracking from proceeding in northwest England.
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Friends of the Earth campaigner Rose Dickinson said fracking poses risks to the environment and the latest tremor was "deeply concerning".
The exploration is the first fracking in the United Kingdom for seven years, after work by Cuadrilla was halted in 2011 following two tremors near Blackpool.
"Fracking only started 11 days ago".
'This is deeply concerning for those living nearby and why the industry must be closely monitored.
The natural disaster occurred just 11 days after Lancashire fracking got the go ahead.
Any tremor measuring 0.5 or above means fracking must be temporarily stopped while tests are carried out.
Hydraulically fracturing, or fracking, involves extracting gas from rocks by breaking them up with water and chemicals at high pressure.