%0 Journal Article
%@ 0094-8276
%A Clarke, Huw
%A Eisner, Leo
%A Styles, Peter
%A Turner, Peter
%A Cuadrilla Resources Ltd, Lich!eld, UK,
%A Institute of Rock Structure and Mechanics, Academy of Sciences of the Czech Republic, Prague, Czech Republic,,
%A Applied and Environmental Geophysics Research Group, School of Physical and Geographical Sciences, Keele University, Keele, UK,,
%A Brigantia Resources Ltd, Lichfeld, UK,
%D 2014
%F epos:1678
%I American Geophysical Union
%J Geophysical Research Letters
%N 23
%P 8308-8314
%T Felt seismicity associated with shale gas hydraulic fracturing: The first documented example in Europe
%U https://episodesplatform.eu/eprints/1678/
%V 41
%X We describe the origin of felt seismicity during the hydraulic fracturing of the Carboniferous  Bowland Shale at the Preese Hall 1 exploration well near Blackpool in the UK during 2011. The seismicity  resulted from the interaction of hydraulic fracturing and a fault, the location of which was unknown at the time  but has subsequently been located and does not intersect the well borehole. Waveform cross correlation is  used to detect 50 events in the sequence. A representative hypocenter and strike-slip focal mechanism is  calculated using the best recorded seismic event. The hypocenter is calculated to lie 300–400m east, and  330–360m below the injection point and shown to lie on a fault imaged using 3-D seismic at a depth of about  2930m. The 3-D survey shows that not only the event hypocenter but also the focal mechanism correlates  strongly with a subsequently identi!able transpressional fault formed during the Late Carboniferous (Variscan)  basin inversion.