Energy firm Cuadrilla says, operations began at the Lancashire site in October for the first time since 2011 when it was suspended because of earth tremors.
There have been suspensions of the renewed underground drilling operations after further tremors in the area.
Cuadrilla says the site may provide “a significant source” of gas.
But local MP Rosie Cooper has said fracking at the site should be banned immediately, following a 1.1 magnitude tremor on Monday – the strongest since work began on 15 October.
Since then, the shapre price in Cuadrilla’s parent company AJ Lucas has fallen.
According to the British Geological Survey, earthquakes with a magnitude of less than two are not usually felt and, if they are, it is only by people very close to the epicentre.