Using data from the geothermal field in the Cooper Basin (South Australia), we study the relationship between the horizontal and vertical relative location of consecutive events (RLCE) and magnitude.

The obtained spatial distribution of RLCE shows a striking shape, in that it suggests a magnitude dependence, with smaller event separations towards higher magnitudes. This effect is real, and apparently caused by the existence of aftershocks for low to moderate energy events.

In order to understand the factors controlling induced seismicity, we investigate the relation between the injected volume and seismic moment. Seismicity appears predominantly controlled by the fault area rather than the injected volume.

Finally, estimations of the seismic efficiency provide the basis for a distinction between “triggered” and “induced” events.


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