Fig. 6: EW-tests applied to PNR-2.
From: The bound growth of induced earthquakes could de-risk hydraulic fracturing
EW-tests are shown for a the western-most and b eastern-most clusters. The input data includes earthquake magnitudes (circles), the sequence of observed MLRG (red line), alongside the expected MLRG at the 10/50/90 percentiles (red area); two possible injection-based MMAX models are considered (blue lines). Correspondingly, the ensemble weights from the EW-test are shown; the seismic response is spatially partitioned into eastern/western clusters, where stages sequentially transition from bound into unbound (Figs. S25–S26). c Map view showing the locations of earthquakes (circles) alongside the PNR-2 well trajectory (black line) and stage locations (grey lines). Throughout the figure, earthquakes are colour coordinated accordingly to their likelihood of being bound or unbound from EW-tests.
