Injection of CO₂ in underground rock formations may trigger seismic events on pre-existing faults in the reservoir formation or in other formations that are reached by the pressure changes caused by the injection. Stress and pore pressure state, as well as the existence, position, and orientation of faults must be understood as thoroughly as possible to define an injection strategy that minimizes the risk of inducing micro-seismic events. Before injection commences, the naturally occurring seismicity in the area should be determined as a baseline against which future seismicity can be compared. C44™ provides all the tools to monitor the occurrence of seismic events 24/7 from surface networks, downhole instruments, or fiber optics. It automatically detects and localizes seismic events and displays all the information to the operator.