Deep underground water injections induce seismicity. When the seismic
fractures coalesce into far-reaching pathways for fluid migration, the
migrating fluid may reach pre-existing faults, and by decreasing fault
strength, can trigger major seismic events. We assume that the potential
for building such pathways depends on closeness of hypocenters,
similarity of fracture planes orientations, and closeness of radii
taking off from the injection point, on which events locate. We define
this potential as the average distance between seismic events in the
space of parameters quantifying the above conditions. We show that in
the studied case from The Geysers geothermal field, this potential is
highly correlated with injection rate. When the overall level of
injection rate is high, the higher the injection rate, the more the
potential for building far-reaching pathways for fluid migration is
reduced.