Supplementary figures include a map of The Geysers with the locations and deviatoric moment tensor solutions shaded by hypocenter depth. There is also a plot of the distributions of isotropic parameter K for events from the 1992–2012 Berkeley Seismological Laboratory (BSL) catalog and studied events at The Geysers. Figures from the constrained moment tensor analysis of selected events are also included. Catalogs of deviatoric and full moment tensor (FMT) solutions as presented in the main article are also provided.
Figure S1. Deviatoric moment tensor solutions, shaded by hypocenter depth determined by the Northern California Seismic System, of numbered events listed in Tables S1 and S2. The red line shows the extent of the geothermal steam field (Craig Hartline personal communication, 2012), and black lines indicate the surface traces of known faults. The inset shows the locations of the broadband stations used in the analysis.
Figure S2. (a) Distribution of isotropic parameter K for events from the 1992–2012 Berkeley Seismological Laboratory (BSL, blue) catalog and studied events at The Geysers (red) with normal distributions overlaid. (b) Normal probability plot of isotropic parameter K for the BSL catalog (blue) and studied events at The Geysers (red).
Figure S3. Event 37: Mw 3.99, 24 February 2008. (a) Network sensitivity solution (NSS) for first motions. (b) NSS for FMT waveform analysis. (c) Constrained NSS obtained by testing the output of the waveform NSS against first-motion observations. This solution is a best fit to both the long-period waveforms and the first motions. (d) Observed (black) and synthetic (red) waveforms for the FMT solution. (e) Deviatoric solution and first motions. Compressional and dilatational first motions are shown with black and green plusses, respectively. (f) FMT solution and first motions. (g) Constrained FMT (CFMT) solution and first motions. The fit to the first motions in each case is given by the number of stations with first motions inconsistent with the various moment tensor solutions. A high number of stations with discrepant first-motion observations indicates a poor fit.
Figure S4. Event 31: Mw 4.71, 12 May 2006. (a) NSS for first motions. (b) NSS for FMT waveform analysis. (c) Constrained NSS obtained by testing the output of the waveform NSS against first-motion observations. This solution is a best fit to both the long-period waveforms and the first motions. (d) Observed (black) and synthetic (red) waveforms for the FMT solution. (e) Deviatoric solution and first motions. Compressional and dilatational first motions are shown with black and green plusses, respectively. (f) FMT solution and first motions. (g) Constrained FMT (CFMT) solution and first motions. The fit to the first motions in each case is given by the number of stations with first motions inconsistent with the various moment tensor solutions. A high number of stations with discrepant first-motion observations indicates a poor fit.
Figure S5. Event 9: Mw 4.14, 16 January 1995. (a) NSS for first motions. (b) NSS for FMT waveform analysis. (c) Constrained NSS obtained by testing the output of the waveform NSS against first-motion observations. This solution is a best fit to both the long-period waveforms and the first motions. (d) Observed (black) and synthetic (red) waveforms for the FMT solution. (e) Deviatoric solution and first motions. Compressional and dilatational first motions are shown with black and green plusses, respectively. (f) FMT solution and first motions. (g) Constrained FMT (CFMT) solution and first motions. The fit to the first motions in each case is given by the number of stations with first motions inconsistent with the various moment tensor solutions. A high number of stations with discrepant first-motion observations indicates a poor fit.
Download/View: Table S1 [Plain Text Comma-separated Values; ~8 KB]. Deviatoric moment tensor solutions. Event ID, Northern California Seismic System (NCSS) event identification number; depth (km), latitude (°), and longitude (°) are from the NCSS catalog; MT Depth, moment tensor depth; Mw, moment magnitude; M0, seismic moment in units of dyn·cm; Mxx, Mxy, Mxz, Myy, Myz, Mzz, moment tensor values in Aki convention with units of 1×1020 dyn·cm; DC, percent double couple; CLVD, percent compensated linear vector dipole; and VR, deviatoric variance reduction. The full moment tensor solution should be used for the event marked with an asterisk.
Download/View: Table S2 [Plain Text Comma-separated Values; ~10 KB]. Full moment tensor solutions. Event ID, Northern California Seismic System (NCSS) event identification number; depth (km), latitude (°), and longitude (°) are from the NCSS catalog; M0D&W, scalar moment using Dziewonski and Woodhouse (1983) definition (dyn·cm); M0TOT, scalar moment using total moment definition from Bowers and Hudson (1999) (dyn·cm); MwD&W, moment magnitude using Dziewonski and Woodhouse (1983) definition for scalar moment; MwTOT, moment magnitude using Bowers and Hudson (1999) definition for total scalar moment; Mxx, Mxy, Mxz, Myy, Myz, and Mzz, moment tensor values in Aki convention (units of 1×1020 dyn·cm); DC, percent double couple; CLVD, percent compensated linear vector dipole; ISO, percent isotropic component; VR, full moment tensor (FMT) variance reduction; and F-sig, F-test statistical significance between the FMT and deviatoric solutions. The full moment tensor solution should be used for the event marked with an asterisk.
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