Induced Earthquake Potential in Geothermal Reservoirs: Insights From the Geysers, California

Limited Earthquake Interaction During a Geothermal Hydraulic Stimulation in Helsinki, Finland

“…Activation and growth of a small‐scale network of randomly distributed fractures and joints may be less prone to host larger seismic events (cf. discussion in Martínez‐Garzón et al., 2020). Therefore, near‐real‐time assessment of spatio‐temporal behavior of seismic event locations, focal mechanisms, and temporal evolution of statistical properties such as b ‐value, c‐value, and d‐value (Dresen et al., 2020; Eaton & Igonin, 2018; Goebel et al., 2017; Schoenball et al., 2015) is key to identify the existence/emergence of large fault structures.…”

“…For example, McGarr (2014) proposed that total seismic moment release (the static deformation caused by earthquakes) and maximum event magnitude increase linearly with total volume of fluid injected, $${M}_{0}^{\mathrm{max}}\propto {V}^{1}$$, $${\sum M}_{0}\propto {V}^{1}$$, or alternatively to the volume of rock mass perturbed by fluid injection $${V}^{\mathrm{p}\mathrm{e}\mathrm{r}\mathrm{t}\mathrm{u}\mathrm{r}\mathrm{b}\mathrm{e}\mathrm{d}}$$ and average pore pressure increase in that volume, $${M}_{0}^{\mathrm{max}}\propto {V}^{\mathrm{p}\mathrm{e}\mathrm{r}\mathrm{t}\mathrm{u}\mathrm{r}\mathrm{b}\mathrm{e}\mathrm{d}}{\Delta}P$$ (cf. Kwiatek et al., 2015; Martínez‐Garzón et al., 2020). The fracture mechanics‐based model of Galis et al.…”