Induced seismicity is also a cause for concern, albeit it is not expected to be a significant problem at geological CO2 storage sites if good engineering practices are followed. The measures generally taken to alleviate such effects consist in fluid pressure management. For example, the injection of CO2 is often conducted simultaneously with the co-extraction of formation brine in saline aquifers or extraction of oil/gas at EOR/EGR sites, which can control the amplitude of the overpressure in the reservoir and along faults. 182