2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
Stansbury fault zone	Utah

GEOMETRY
Dip (degrees)	40/50/60
Dip direction	W
Sense of slip	normal
Rupture top (km)	0
Rupture bottom (km)	15
Rake (degrees)	-90
Length (km)	54

MODEL VALUES
Probability of activity	1
Minimum magnitude	6.5
Maximum magnitude	7.09
b-value	0.8

Assigned Dip	Fault-Parallel Slip Rate	Width	Annual Rate	a-value	Branch Weight
40	0.62	23.3	4.87e-04	1.772	0.2
50	0.52	19.6	3.43e-04	1.619	0.6
60	0.46	17.3	2.68e-04	1.513	0.2

Comments
The assigned slip rate is the preferred slip rate reported by Swan and others (2005) of 0.4?0.1 mm/yr, and Geomatrix Consultants, Inc. (1999) and Hanson and others (2000) of 0.39?0.04. Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Selected References
Geomatrix Consultants, Inc., 1999, Fault evaluation study and seismic hazard assessment, Private Fuel Storage Facility, Skull Valley, Utah: Technical report to Stone and Webster Engineering Corporation, San Francisco, California, under Contract 4790, 118 p., scale 1:100,000. Helm, J.M., 1994, Structure and tectonic geomorphology of the Stansbury fault zone, Tooele County, Utah, and the effect of crustal structure on Cenozoic faulting patterns: Salt Lake City, University of Utah, unpublished M.S. thesis, 128 p. Hanson, K.L., Swan, F.H., Angell, M.A., and Youngs, R.R., 2000, Application of probabilistic seismic ground-motion and fault displacement hazard analyses based on new evidence of late Pleistocene acitve mid-valley faults—Skull Valley, Utah: Seismological Research Letters, v. 71, no. 1, p. 264-265. Swan, F.H., Hanson, K.L., Youngs, R.R., and Angell, M.M., 2005, Paleoseismic investigations of the Stansbury and mid-valley faults, Skull Valley, Utah, in Lund, W.R., ed., Proceedings Volume—Basin and Range Province Seismic Hazards Summit II: Utah Geological Survey Miscellaneous Publication 05-2. Lund, W.R., ed., 2006, Basin and Range Province Earthquake Working Group seismic-hazard recommendations to the U.S. Geological Survey National Seismic Hazard Mapping Program: Utah Geological Survey Open-File Report 477, 23 p, ugspub.nr.utah.gov/publications/open_file_reports/OFR-477.pdf.

Selected References

Geomatrix Consultants, Inc., 1999, Fault evaluation study and seismic hazard assessment, Private Fuel Storage Facility, Skull Valley, Utah: Technical report to Stone and Webster Engineering Corporation, San Francisco, California, under Contract 4790, 118 p., scale 1:100,000.
Helm, J.M., 1994, Structure and tectonic geomorphology of the Stansbury fault zone, Tooele County, Utah, and the effect of crustal structure on Cenozoic faulting patterns: Salt Lake City, University of Utah, unpublished M.S. thesis, 128 p.
Hanson, K.L., Swan, F.H., Angell, M.A., and Youngs, R.R., 2000, Application of probabilistic seismic ground-motion and fault displacement hazard analyses based on new evidence of late Pleistocene acitve mid-valley faults—Skull Valley, Utah: Seismological Research Letters, v. 71, no. 1, p. 264-265.
Swan, F.H., Hanson, K.L., Youngs, R.R., and Angell, M.M., 2005, Paleoseismic investigations of the Stansbury and mid-valley faults, Skull Valley, Utah, in Lund, W.R., ed., Proceedings Volume—Basin and Range Province Seismic Hazards Summit II: Utah Geological Survey Miscellaneous Publication 05-2.
Lund, W.R., ed., 2006, Basin and Range Province Earthquake Working Group seismic-hazard recommendations to the U.S. Geological Survey National Seismic Hazard Mapping Program: Utah Geological Survey Open-File Report 477, 23 p, ugspub.nr.utah.gov/publications/open_file_reports/OFR-477.pdf.