TY  - CONF
ID  - epos1965
UR  - http://meetingorganizer.copernicus.org/ESC2016/ESC2016-206.pdf
A1  - Lopez-Comino, Jose Angel
A1  - Cesca, Simone
A1  - Kriegerowski, Marius
A1  - Heimann, Sebastian
A1  - Dahm, Torsten
A1  - Mirek, Janusz
A1  - Lasocki, Stanislaw
Y1  - 2016/09//
N2  - Hydraulic fracturing is considered among the human operations which could induce or trigger seismicity or
microseismic activity. The in?uence of hydraulic fracturing operations is typically expected in terms of weak
magnitude events, although moderate magnitude events associated to fracturing operations have been recently
observed in Canada. The sensitivity of the rock mass to trigger seismicity varies signi?cantly for different sites
and cannot be easily predicted prior to operations. However, the detection and location performances of a planned
monitoring network can be assessed and this information later used to judge the amount of background and
induced microseismicity. We perform a seismic monitoring at a shale gas exploration/exploitation site in the
central-western part of the Peribalticsynclise at Pomerania (Poland). The monitoring setup includes a distributed
network of broadband stations covering a region of 60 km2, and three small-scale arrays of short-period stations
with aperture between 450 and 950 m. The fracking operations are planned in May 2016 at a depth 4000 m
in two horizontal wells. The monitoring of background seismicity started in July 2015 and will be continued
during and after the termination of hydraulic fracturing operations. Seismic data from the pre-operational phase
can be used to assess the seismic noise and the detection performance of our monitoring setup, making use of a
synthetic microseismic catalogue and synthetic waveform dataset. We adopt a recently developed tool to generate
a synthetic catalogue, considering a realistic distribution of hypocenters, magnitudes, moment tensors and source
durations. Synthetic waveforms are generated for a local crustal model and superposed to real noise traces
reproducing true monitoring conditions. Detection rates are used to estimate the detection probability for different
magnitudes, source-receiver distances and noise conditions, ?nally mapping the magnitude of completeness in a
target volume around the hydraulic fracturing horizontal wells. Our technique is useful to evaluate the ef?ciency
of the seismic network and validate detection and location algorithms, taking into account the signal to noise ratio.
The application of a detection tool to synthetic and real seismic data during different phases is then discussed in
the framework of our concept to assess the monitoring performance.

This work is funded by the EU H2020 SHEER project.
TI  - Seismic monitoring performance for hydraulic fracturing
M2  - Trieste, Italy
AV  - public
T2  - 35th General Assembly of the European Seismological Commission
ER  -