2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
Wasatch fault, Salt Lake City section	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)	48

MODEL VALUES
Probability of activity	1
Minimum magnitude	6.5
Maximum magnitude	7.00
b-value	0.8

Assigned Dip	Width	Annual Rate	a-value	Branch Weight
40	23.3	7.70e-04	2.413	0.2
50	19.6	7.70e-04	2.260	0.6
60	17.3	7.70e-04	2.154	0.2

Comments
Preferred vertical slip rate and recurrence interval are consensus values reported by Lund (2005). Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Selected References
Swan, F.H.I., Schwartz, D.P., Hanson, K.L., Kneupfer, P.L., and Cluff, L.S., 1981, Study of earthquake recurrence intervals on the Wasatch fault at the Kaysville site, Utah: U.S. Geological Survey Open-File Report 81-228, 30 p. McCalpin, J.P., 2002, Paleoseismology of Utah, volume 10—Post-Bonneville paleoearthquake chronology of the Salt Lake City segment, Wasatch fault zone, from the 1999 "megatrench" site: Utah Geological Survey Miscellaneous Publication 02-7, 37 p., http://ugspub.nr.utah.gov/publications/misc_pubs/mp-02-7.pdf. 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. Scott, W.E., 1989, Temporal relations of lacustrine and glacial events at Little Cottonwood and Bells Canyons, in Machette, M.N., ed., In the footsteps of G.K. Gilbert-Lake Bonneville and neotectonics of the eastern Basin and Range Province, Guidebook for Field Trip Twelve: Utah Geological and Mineral Survey Miscellaneous Publication 88-1, p. 78-81. 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

Swan, F.H.I., Schwartz, D.P., Hanson, K.L., Kneupfer, P.L., and Cluff, L.S., 1981, Study of earthquake recurrence intervals on the Wasatch fault at the Kaysville site, Utah: U.S. Geological Survey Open-File Report 81-228, 30 p.
McCalpin, J.P., 2002, Paleoseismology of Utah, volume 10—Post-Bonneville paleoearthquake chronology of the Salt Lake City segment, Wasatch fault zone, from the 1999 "megatrench" site: Utah Geological Survey Miscellaneous Publication 02-7, 37 p., http://ugspub.nr.utah.gov/publications/misc_pubs/mp-02-7.pdf.
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.
Scott, W.E., 1989, Temporal relations of lacustrine and glacial events at Little Cottonwood and Bells Canyons, in Machette, M.N., ed., In the footsteps of G.K. Gilbert-Lake Bonneville and neotectonics of the eastern Basin and Range Province, Guidebook for Field Trip Twelve: Utah Geological and Mineral Survey Miscellaneous Publication 88-1, p. 78-81.
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.