2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
Wasatch fault, Levan section	Utah

GEOMETRY
Dip (degrees)	60/50/40
Dip direction	W
Sense of slip	normal
Rupture top (km)	0
Rupture bottom (km)	15
Rake (degrees)	-90
Length (km)	32

MODEL VALUES
Probability of activity	1
Minimum magnitude	6.5
Maximum magnitude	6.80
b-value	0.8

Assigned Dip	Width	Annual Rate	a-value	Branch Weight
40	23.3	2.37e-04	1.715	0.2
50	19.6	2.37e-04	1.563	0.6
60	17.3	2.37e-04	1.456	0.2

Comments
Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Selected References
Lund, W.R., 2005, Consensus preferred recurrence interval and vertical slip rate estimates—Review of Utah paleoseismic-trenching data by the Utah Quaternary Fault Parameters Working Group: Utah Geological Survey Bulletin 134, compact disk. Hylland, M.D., and Machette, M.N., 2004, Interim surficial geologic map of the Levan segment of the Wasatch fault zone, Juab and Sanpete Counties, Utah, in Christenson, G.E., Ashland, F.X., Hylland, M.D., McDonald, G.N., and Case, B., eds., Database compilation, coordination of earthquake-hazards mapping, and study of the Wasatch fault and earthquake-induced landslides, Wasatch Front, Utah: Technical Report to the U.S. Geological Survey, Reston, Virginia, under Contract 03HQAG0008, variously paginated, scale 1:50,000. 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

Lund, W.R., 2005, Consensus preferred recurrence interval and vertical slip rate estimates—Review of Utah paleoseismic-trenching data by the Utah Quaternary Fault Parameters Working Group: Utah Geological Survey Bulletin 134, compact disk.
Hylland, M.D., and Machette, M.N., 2004, Interim surficial geologic map of the Levan segment of the Wasatch fault zone, Juab and Sanpete Counties, Utah, in Christenson, G.E., Ashland, F.X., Hylland, M.D., McDonald, G.N., and Case, B., eds., Database compilation, coordination of earthquake-hazards mapping, and study of the Wasatch fault and earthquake-induced landslides, Wasatch Front, Utah: Technical Report to the U.S. Geological Survey, Reston, Virginia, under Contract 03HQAG0008, variously paginated, scale 1:50,000.
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.