Figure 5

(a,b) Wellhead operational parameters against the cumulative number of induced events (including those only detected) and the cumulative seismic moment of located events during time. (a) Cumulative number of events (solid red line) against the average fluid injection pressure (dashed yellow line) and the daily injected volumes (solid blue line). (b) Cumulative seismic moment of events (solid red line) against the daily fluid injection energy (dashed green line) and again the daily injected volumes (solid blue line). The four periods of time where the seismicity shows different space–time characteristics are indicated on the top of the panels by means of black double-ended arrows. Crucial dates are indicated with vertical dashed grey lines. (c) Average daily seismic moment of events occurred above (cyan line) and below (violet line) a given injection rate threshold as a function of the daily injection rate threshold.