2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
Rock Creek fault	Wyoming

GEOMETRY
Dip (degrees)	60/50/40
Dip direction	W
Sense of slip	normal
Rupture top (km)	0
Rupture bottom (km)	15
Rake (degrees)	-90
Length (km)	41

MODEL VALUES
Probability of activity	1
Minimum magnitude	6.5
Maximum magnitude	6.95
b-value	0.8

Assigned Dip	Fault-Parallel Slip Rate	Width	Annual Rate	a-value	Branch Weight
40	2.65	23.3	2.55e-03	2.512	0.2
50	2.22	19.6	1.79e-03	2.360	0.6
60	1.96	17.3	1.40e-03	2.253	0.2

Comments
The preferred vertical slip rate is based on scarps up to 25 m high on 15 ka colluvium (McCalpin, 1993). Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Selected References
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. McCalpin, J.P., 1993, Neotectonics of the northeastern Basin and Range margin, western USA: Zeitschrift fuer Geomorphologie N. Folge, v. 94, p. 137-157. McCalpin, J.P.and Warren, G.A., 1992, Quaternary faulting on the Rock Creek fault, overthrust belt, Wyoming: Geological Society of America Abstracts with Programs, v. 24, no. 6, p. 51.

Selected References

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.
McCalpin, J.P., 1993, Neotectonics of the northeastern Basin and Range margin, western USA: Zeitschrift fuer Geomorphologie N. Folge, v. 94, p. 137-157.
McCalpin, J.P.and Warren, G.A., 1992, Quaternary faulting on the Rock Creek fault, overthrust belt, Wyoming: Geological Society of America Abstracts with Programs, v. 24, no. 6, p. 51.