The FORGE site is situated on the western flank of the Mineral Mountains in southwest Utah, near the eastern margin of the Milford Valley (Fig. The Utah Frontier Observatory for Research in Geothermal Energy (FORGE) project aims to establish an enhanced geothermal systems (EGS) laboratory to develop and test new technologies that improve geothermal energy extraction from low-permeability host rocks (Moore et al. North America, Waveform inversion, Seismic noise, Sedimentary basin processes 1 INTRODUCTION The quasi-3-D velocity model shows that the base of the basin dips ∼22° to the west and topography on the basement interface coincident with the Mag Lee Wash suggests that the bedrock interface is an unconformity. Moreover, the resulting Vs profile is consistent with a Vs profile derived from distributed acoustic sensing (DAS) data located in a borehole at the FORGE site. Thus, a high-resolution quasi-3-D Vs model from the surface to 2.0 km depth is derived and shows that surface-parallel sedimentary strata deepen to the west, consistent with a 3-D seismic reflection survey. Profiles with error bars are determined by calculating coherency functions that fit observations in a frequency range of 0.2–5 Hz. Combinations of 4 and 9 geophones in subarrays provide for 36 and 25 1-D Vs profiles, respectively. We expand the application of spatial autocorrelation (SPAC) from typical 1-D Vs profiles to quasi-3-D imaging via Bayesian Monte Carlo inversion (BMCI) using a dense nodal array (49 nodes) located at the Utah Frontier Observatory for Research in Geothermal Energy (FORGE) site.
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