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Zusammenfassung:
In this study we analyze the nano- and picoseismicity recorded during the Fatigue Hydraulic Fracturing (FHF) in situ experiment
performed in Äspö Hard Rock Laboratory, Sweden. The fracturing experiment composed of six fractures driven by three
different water injection schemes (continuous, progressive and pulse pressurization) was performed during the year 2015 inside
a 28 m long, horizontal borehole located at 410 m depth. The fracturing process was monitored with two different seismic
networks covering a wide frequency band between 0.01 Hz and 100000 Hz, including broadband seismometers, geophones, high
frequency accelerometers and acoustic emission sensors. The combined seismic network allowed for detection and detailed
analysis of nearly 200 seismic events with moment magnitudes MW < -4 that occurred solely during the hydraulic fracturing
stages. We relocated the seismic catalog using double-difference technique and calculated the source parameters (seismic
moment, source size, stress drop, focal mechanism and seismic moment tensor). The derived physical characteristics of induced
seismicity are compared with the stimulation parameters as well as with the geomechanical parameters of the site.
