1. Injection pressure: The higher the injection pressure used during fracking, the greater the likelihood of induced seismicity. This is because high pressure can create fractures in the rock that allow fluids to flow into and lubricate existing faults, making them more likely to slip and cause an earthquake.
2. Injection volume: The larger the volume of fluid injected during fracking, the greater the likelihood of induced seismicity. This is because a larger volume of fluid can increase the pore pressure in the rock, which can reduce the friction on faults and make them more likely to slip.
3. Injection rate: The faster the fluid is injected during fracking, the greater the likelihood of induced seismicity. This is because a rapid injection rate can create high-pressure gradients that can cause the rock to fracture and slip.
4. Formation properties: The properties of the rock formation being fracked can also influence the likelihood of induced seismicity. Factors such as the rock type, porosity, permeability, and stress state can affect the likelihood of fault slip and earthquake occurrence.
5. Presence of pre-existing faults: The presence of pre-existing faults in the area being fracked can increase the likelihood of induced seismicity. This is because faults can provide pathways for fluid flow and can be reactivated by the pressure changes associated with fracking.
6. Depth of injection: The depth at which fracking is conducted can also influence the likelihood of induced seismicity. Earthquakes tend to occur more frequently at shallower depths, where the rock is less consolidated and more susceptible to fracturing.
7. Distance from injection site: The distance between the injection site and nearby communities or sensitive areas can also be a factor in assessing the potential for fracking-induced seismicity. Earthquakes that occur close to populated areas or other sensitive sites can pose a greater risk to public safety and infrastructure.
8. Regulatory framework: The regulatory framework governing fracking and induced seismicity can also play a role in mitigating the likelihood and impacts of fracking-related earthquakes. Stricter regulations, such as limits on injection pressure and volume, can help to reduce the risk of induced seismicity.
