2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
Bonham Ranch fault zone	Nevada

GEOMETRY
Dip (degrees)	40/60/50
Dip direction	E
Sense of slip	normal
Rupture top (km)	0
Rupture bottom (km)	15
Rake (degrees)	-90
Length (km)	56

MODEL VALUES
Probability of activity	1
Minimum magnitude	6.5
Maximum magnitude	7.11
b-value	0.8

Assigned Dip	Fault-Parallel Slip Rate	Width	Annual Rate	a-value	Branch Weight
40	0.31	23.3	2.36e-04	1.479	0.2
50	0.26	19.6	1.66e-04	1.326	0.6
60	0.23	17.3	1.30e-04	1.220	0.2

Comments
Weick (1990) estimated a maximum Holocene vertical slip rate of about 0.7 mm/yr from 3.5 m (multiple events) of vertical separation of sediment estimated to be about 5 ka. However, the maximum age of the deposits is not convincingly demonstrated and may be as old as 12 ka. Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Selected References
Weick, R.J., 1990, Structural, tectonic and Quaternary study of the eastern Madeline Plains, California and southwestern Smoke Creek Desert, Nevada: Reno, University of Nevada, unpublished M.S. thesis, 160 p. Lund, W.R., ed., 2006, Basin and Range Province Earthquake Working Group seismic-hazard recommendations to the U.S. Geological Survey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

Weick, R.J., 1990, Structural, tectonic and Quaternary study of the eastern Madeline Plains, California and southwestern Smoke Creek Desert, Nevada: Reno, University of Nevada, unpublished M.S. thesis, 160 p.
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.