2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
Black Hills fault	Nevada

GEOMETRY
Dip (degrees)	40/50/60
Dip direction	SE
Sense of slip	normal
Rupture top (km)	0
Rupture bottom (km)	15
Rake (degrees)	-90
Length (km)	9

MODEL VALUES
Probability of activity	1
Minimum magnitude	n/a
Maximum magnitude	6.18
b-value	n/a

Assigned Dip	Fault-Parallel Slip Rate	Width	Annual Rate	a-value	Branch Weight
40	0.16	23.3	4.58e-04	n/a	0.2
50	0.13	19.6	3.23e-04	n/a	0.6
60	0.12	17.3	2.53e-04	n/a	0.2

Comments
Fossett (2005) calculates that the slip rate for this fault is 0.33 to 0.55 mm/yr based on trenching. Fossett and Taylor (2003) report a slip rate of 0.4 to 0.5 mm/yr based on the results of the same trenching study. The preferred vertical slip rate is less than the average of the publish slip rates because the above estimates are regarded as maxima in the original work. Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Comments

Fossett (2005) calculates that the slip rate for this fault is 0.33 to 0.55 mm/yr based on trenching. Fossett and Taylor (2003) report a slip rate of 0.4 to 0.5 mm/yr based on the results of the same trenching study. The preferred vertical slip rate is less than the average of the publish slip rates because the above estimates are regarded as maxima in the original work. 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. Fossett, E., 2005, Paleoseismology of the Black Hills fault, southern Nevada, and implications for regional tectonics: University of Nevada, Las Vegas, unpublished Masters thesis, 94 p. Fossett, E. and Taylor, W.J., 2003, Evidence and implications of Holocene faulting along the Black Hills fault, southern Nevada: Geological Society of America, Abstracts with Program, v. 35, p. 476.

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.
Fossett, E., 2005, Paleoseismology of the Black Hills fault, southern Nevada, and implications for regional tectonics: University of Nevada, Las Vegas, unpublished Masters thesis, 94 p.
Fossett, E. and Taylor, W.J., 2003, Evidence and implications of Holocene faulting along the Black Hills fault, southern Nevada: Geological Society of America, Abstracts with Program, v. 35, p. 476.