Publication Date:
2020-10-22
Description:
The storage concession "Minerbio Stoccaggio" (Bologna, Northern Italy) covers a 69 km 2 area, 65% of hich is located in the Minerbio municipality. Since 1979, a microseismic network for the monitoring of seismicity, eventually induced by gas storage activities, has been installed in this area. The network was operated
by Stogit S.p.A, a subsidiary company of Snam, which is the largest storage operator in Italy. In 2016, the microseismic network, consisting of three surface stations and one 100-m-deep borehole sensor with minimum interstation distances of about 3.0 km, was integrated with 12 regional stations installed in an 80 × 80 km 2 area centered on the surface projection of the reservoir. In 2018, the microseismic network was enhanced by adding one surface and three 150-m-deep borehole stations. In this work, we evaluate the detection improvement of the microseismic network, integrated with the regional stations. We define two crustal volumes for earthquake detection: the inner domain of detection, IDD (10 × 10 × 5) km 3 , within
which we should ensure the highest network performance, and the extended domain of detection, EDD (22 × 22 × 11) km 3 . By comparing the simulated power spectral density of hypothetical seismic sources located in EDD with the average power spectra of ambient seismic noise observed at each station site, we calculate detection and localization thresholds for the two above-mentioned networks. Under unfavourable noise conditions, we find that the present operative seismic network allows locating earthquakes with M L ≥ 0.8 occurring at the depth of the reservoir and with M L ≥ 1.0 if located within IDD.
Description:
Funding information This study received financial support
from BComune di Minerbio^ under the grant BSperimentazione
ILG Minerbio^ (grant number 0913.010)
Description:
Published
Description:
967–977
Description:
3SR TERREMOTI - Attività dei Centri
Description:
JCR Journal
Keywords:
Induced seismicity
;
Earthquake detection
;
Ambient seismic noise
;
Microseismic monitoring
;
MiSE
;
oilfield monitoring guidelines
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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