Injection-induced seismicity has been one of the major obstacles in front of developing geothermal resources and a source of disturbance in populated locations. Many efforts have been made to understand underground processes leading to induced seismicity in order to control and mitigate it during thermal energy extraction. My thesis aims to investigate different factors, related to the operating and geologic conditions, leading to the occurrence of seismic events, and to derive optimum operating procedures to mitigate induced seismicity based on the proposed model. During my thesis work, I developed two conceptual models using the finite volume code Itasca FLAC3D to model thermo-hydro-mechanical processes in the reservoir.