2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
Dutchman Draw fault	Arizona

GEOMETRY
Dip (degrees)	60/40/50
Dip direction	NW
Sense of slip	normal
Rupture top (km)	0
Rupture bottom (km)	15
Rake (degrees)	-90
Length (km)	16

MODEL VALUES
Probability of activity	1
Minimum magnitude	n/a
Maximum magnitude	6.49
b-value	n/a

Assigned Dip	Fault-Parallel Slip Rate	Width	Annual Rate	a-value	Branch Weight
40	0.12	23.3	2.21e-04	n/a	0.2
50	0.10	19.6	1.55e-04	n/a	0.6
60	0.09	17.3	1.22e-04	n/a	0.2

Comments
Assigned vertical slip rate is based on 100 m offset of an early Quaternary basalt, dated at 1.4?0.3 Ma (Wenrich and others, 1995). From these data, P.A. Pearthree (written commun., 2002) calculated a slip rate of 0.06-0.09 mm/yr. We assigned the average of this range. Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Selected References
Wenrich, K.J., Billingsley, G.H., and Blackerby, B.A., 1995, Spatial migration and compositional changes of Miocene-Quaternary magmatism in the western Grand Canyon: Journal of Geophysical Research, v. 100, no. B7, p. 10,417-10,440. 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

Wenrich, K.J., Billingsley, G.H., and Blackerby, B.A., 1995, Spatial migration and compositional changes of Miocene-Quaternary magmatism in the western Grand Canyon: Journal of Geophysical Research, v. 100, no. B7, p. 10,417-10,440.
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.