TY  - JOUR
ID  - epos1678
UR  - http://doi.org/10.1002/2014GL062047
IS  - 23
A1  - Clarke, Huw
A1  - Eisner, Leo
A1  - Styles, Peter
A1  - Turner, Peter
Y1  - 2014/11//
N2  - 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.
PB  - American Geophysical Union
JF  - Geophysical Research Letters
VL  - 41
SN  - 0094-8276
TI  - Felt seismicity associated with shale gas hydraulic fracturing: The first documented example in Europe
SP  - 8308
AV  - none
EP  - 8314
ER  -