Table 1: Wasatch Front strain rates from geodetic, seismic, and geologic determinations.
Method | Source | Least (Top) and Greatest Principal Strain Rate (µstrain/yr) | Horizontal Displacement and Slip Rates (mm/yr) | Orientation of Least Principal Strain Rate or Stress (degrees from N) | |
Geodetic |
This study: GPS only [1992-1995] |
0.049 ± 0.023 -0.033 ± 0.020 |
2.7 ± 1.3 (55 km) | 59° ± 15° | |
This study: GPS-Trilateration [1970-1994] | 0.054 ± 0.014 -0.017 ± 0.012 |
3.0 ± 0.8 (55 km) | 74° ± 8° | ||
This study: GPS-Trilateration-Trilateration [1962-1994] | 0.051 ± 0.009 0.005 ± 0.008 |
2.8 ± 0.5 (55 km) | 73° ± 7° | ||
Savage et al. [1992] | 0.047 ± 0.011 | 2.6 ± 0.6 | 90° ± 5° | ||
Late Quaternary Slip Rates | Summarized by McCalpin
and Nishenko [1996] |
0.35-2.0 (dependent on fault segment) | E-W (perpendicular to fault strike) | ||
Seismic Moments | Eddington et al. [1987] | 0.0041 (northern
Wasatch) 0.0012 (southern Wasatch) |
0.13 0.04 |
78° 76° | |
Stress Indicators | Zoback [1989] | NW-SE |