There are two goals for seismic monitoring of Engineered Geothermal Systems (EGS): (1) monitoring for seismic risk (triggering traffic light systems) and (2) characterizing reservoir development. For seismic risk, the emphasis is constraining magnitude and ground motion. For reservoir development, the emphasis is on microseismic event detection and high precision location. At the Utah Frontier Observatory for Research in Geothermal Energy (FORGE), we are testing seismic instrumentation, seismic array configurations, and enhanced seismic processing algorithms. With each operational phase, we prepare a seismic monitoring plan and at the completion of each phase, we evaluate the effectiveness of the seismic monitoring and identify lessons learned to be implemented in the next operational phase. Here, we summarize the evolution of seismic monitoring at Utah FORGE and identify lessons learned. Based on these lessons, we propose some general suggestions for future seismic monitoring at Utah FORGE and suggestions for other EGS projects.

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