Account of hydraulically fractured onshore wells in the UK and seismicity associated with these wells

Results show that there was no obvious correlation between the location of the seismic events and the location of the wells known to have been hydraulically fractured. Apart from Preese Hall 1 case post-treatment seismic activity levels ware identical to pre-treatment levels. Only Preese Hall 1 had a seismic activity spike around the date of treatment and location of the well. Also since the seismic recording timeframe was from 1970, majority of the wells identified to have had some form of hydraulic fracturing couldn't be reviewed for possible seismicity as the treatments happened before this recording time frame. Recorded seismic events around these wells were found to be too low to have caused any major effect, the highest occurrence between the ranges of 0.3 ML-1.5 ML.