2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
Hoback fault	Wyoming

GEOMETRY
Dip (degrees)	50/60/40
Dip direction	SW
Sense of slip	normal
Rupture top (km)	0
Rupture bottom (km)	15
Rake (degrees)	-90
Length (km)	19

MODEL VALUES
Probability of activity	1
Minimum magnitude	6.5
Maximum magnitude	6.56
b-value	0.8

Assigned Dip	Fault-Parallel Slip Rate	Width	Annual Rate	a-value	Branch Weight
40	0.11	23.3	1.88e-04	1.544	0.2
50	0.09	19.6	1.33e-04	1.392	0.6
60	0.08	17.3	1.04e-04	1.285	0.2

Comments
The preferred vewrtical slip rate is based on scarps as high as 10 m (Love and Montagne, 1956) that formed on Bull Lake-equivalent glacial terrane (140 ka). Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Selected References
Love, J.D., and Montagne, J.M., 1956, Pleistocene and recent tilting of Jackson Hole, Teton County, Wyoming: Wyoming Geological Association Guidebook, Eleventh Annual Field Conference, 169-178 p. 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

Love, J.D., and Montagne, J.M., 1956, Pleistocene and recent tilting of Jackson Hole, Teton County, Wyoming: Wyoming Geological Association Guidebook, Eleventh Annual Field Conference, 169-178 p.
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.