Seismic Monitoring of the 2022 Utah FORGE Stimulation: the View from the Surface


Katherine WHIDDEN, Gesa PETERSEN, Kristine PANKOW

Key Words:

Utah FORGE, seismicity, seismic monitoring, seismic network, geophones


Stanford Geothermal Workshop




Enhanced Geothermal Systems



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2029 KB

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In April 2022, Utah FORGE stimulated the horizontally deviated well 16(A)-32. The stimulation consisted of three stages. The first stimulation was in the open hole and for stages two and three well-casing was perforated. The seismic response from the three stages varied as did the seismic monitoring capabilities from instrumentation in the deep boreholes. Using the seismic data collected in the deep boreholes Geo Energie Suisse (GES) compiled a catalog of 2591 of the best recorded events (M -2.09 to 0.52). In this study, we use data from the local surface and shallow-borehole network and separately from a 208 dense nodal geophone deployment that consisted of 13 patches of 16 nodes each. For the nodal geophone array, we stack the data in each patch and explore how to use the stacked traces for detection, location and source analysis. We explore detection algorithms including energy-based back projection and matched-filters. Detection catalogs are compared to the GES catalog in order to explore how to better incorporate surface seismic instrumentation for monitoring engineered geothermal systems.

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