2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
Hurricane fault zone (southern)	Arizona

GEOMETRY
Dip (degrees)	40/50/60
Dip direction	NW
Sense of slip	normal
Rupture top (km)	0
Rupture bottom (km)	15
Rake (degrees)	-90
Length (km)	100

MODEL VALUES
Probability of activity	1
Minimum magnitude	6.5
Maximum magnitude	7.40
b-value	0.8

Assigned Dip	Fault-Parallel Slip Rate	Width	Annual Rate	a-value	Branch Weight
40	0.13	23.3	6.24e-05	1.090	0.2
50	0.11	19.6	4.39e-05	0.938	0.6
60	0.09	17.3	3.44e-05	0.831	0.2

Comments
The preferred vertical slip rate is based on the average vertical displacement rate from study by Fenton and others (2001). Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Selected References
Stenner, H.D., Lund, W.R., Pearthree, P.A., and Everitt, B.L., 1999, Paleoseismic investigation of the Hurricane fault in northwestern Arizona and southwestern Utah: Arizona Geological Survey Open-File Report 99-8, 137 p., http://repository.azgs.az.gov/sites/default/files/dlio/files/2010/u14/OFR99-8Hurricanefault.pdf. Fenton, C.R., Webb, R.H., Pearthree, P.A., Cerling, T.E., and Poreda, R.J., 2001, Displacement rates on the Toroweap and Hurricane faults—Implications for Quaternary downcutting in the Grand Canyon, Arizona: Geology, v. 29, p. 1035-1038. 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

Stenner, H.D., Lund, W.R., Pearthree, P.A., and Everitt, B.L., 1999, Paleoseismic investigation of the Hurricane fault in northwestern Arizona and southwestern Utah: Arizona Geological Survey Open-File Report 99-8, 137 p., http://repository.azgs.az.gov/sites/default/files/dlio/files/2010/u14/OFR99-8Hurricanefault.pdf.
Fenton, C.R., Webb, R.H., Pearthree, P.A., Cerling, T.E., and Poreda, R.J., 2001, Displacement rates on the Toroweap and Hurricane faults—Implications for Quaternary downcutting in the Grand Canyon, Arizona: Geology, v. 29, p. 1035-1038.
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.