2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
Cuddy Mountain-Lick Creek fault	Idaho

GEOMETRY
Dip (degrees)	40/60/50
Dip direction	NW
Sense of slip	normal
Rupture top (km)	0
Rupture bottom (km)	15
Rake (degrees)	-90
Length (km)	30

MODEL VALUES
Probability of activity	1
Minimum magnitude	6.5
Maximum magnitude	6.79
b-value	0.8

Assigned Dip	Fault-Parallel Slip Rate	Width	Annual Rate	a-value	Branch Weight
40	0.08	23.3	9.47e-05	1.206	0.2
50	0.07	19.6	6.67e-05	1.053	0.6
60	0.06	17.3	5.22e-05	0.947	0.2

Comments
The preferred vertical slip rate is based on Zollweg and Wood (1993) who considered 610 m offset of Miocene Columbia River Basalt to determine an average vertical slip rate of 0.04 mm/yr. Location of fault updated to better reflect mapping of Fitzgerald (1982), Geomatrix Consultants, Inc. (1989), and Mann (1989). Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Selected References
Mann, G.M., 1989, Seismicity and late Cenozoic faulting in the Brownlee Dam Area—Oregon and Idaho: U.S. Geological Survey Open-File Report 89-429, 46 p., 4 pls., scale 1:24,000. Geomatrix Consultants, Inc., 1989, Seismotectonic evaluation of Mann Creek and Mason Dam sites: Technical report to U.S. Department of Interior, Bureau of Reclamation, Denver, under Contract 6-CS-81-07310, 118 p., 2 pls., scale 1:250,000. Fitzgerald, J.E., 1982, Geology and basalt stratigraphy of the Weiser Embayment, west-central Idaho, in Bonnichsen, B., and Breckenridge, R.M., eds., Cenozoic geology of Idaho: Idaho Bureau of Mines and Geology Bulletin 26, p. 103-128. 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. Zollweg, J.E., and Wood, S.H., 1993, Faulting relationships, seismicity, design earthquakes, and peak ground accelerations at hydroelectric facilities in Hells Canyon of the Snake River, Idaho-Oregon: Report prepared for Idaho Power Company, 158 p., 3 pls.

Selected References

Mann, G.M., 1989, Seismicity and late Cenozoic faulting in the Brownlee Dam Area—Oregon and Idaho: U.S. Geological Survey Open-File Report 89-429, 46 p., 4 pls., scale 1:24,000.
Geomatrix Consultants, Inc., 1989, Seismotectonic evaluation of Mann Creek and Mason Dam sites: Technical report to U.S. Department of Interior, Bureau of Reclamation, Denver, under Contract 6-CS-81-07310, 118 p., 2 pls., scale 1:250,000.
Fitzgerald, J.E., 1982, Geology and basalt stratigraphy of the Weiser Embayment, west-central Idaho, in Bonnichsen, B., and Breckenridge, R.M., eds., Cenozoic geology of Idaho: Idaho Bureau of Mines and Geology Bulletin 26, p. 103-128.
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.
Zollweg, J.E., and Wood, S.H., 1993, Faulting relationships, seismicity, design earthquakes, and peak ground accelerations at hydroelectric facilities in Hells Canyon of the Snake River, Idaho-Oregon: Report prepared for Idaho Power Company, 158 p., 3 pls.