The authors analyzed the spatial and temporal distribution of the microseismic events with larger magnitude (big events) observed during hydraulic stimulations at the Australian HFR site in the Cooper Basin and European HDR site in Soultz, France. A comparison between the origin time of the big events and the hydraulic record showed that many of the big events occurred after the shut-in at both the sites. We have also found that some of the big events at the Australian site brought very clear extension of the seismic cloud into previously seismically silent zones suggesting that some kind of hydraulic barrier was broken by the big events. Although further investigation is needed, the authors currently consider that the microseismic events at Australian site mainly originate from a slip of asperities in existing fractures although some of the characteristics of the big events are differen

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