2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
Amargosa fault	Texas

GEOMETRY
Dip (degrees)	60/50/40
Dip direction	NE
Sense of slip	normal
Rupture top (km)	0
Rupture bottom (km)	15
Rake (degrees)	-90
Length (km)	70

MODEL VALUES
Probability of activity	1
Minimum magnitude	6.5
Maximum magnitude	7.22
b-value	0.8

Assigned Dip	Fault-Parallel Slip Rate	Width	Annual Rate	a-value	Branch Weight
40	0.17	23.3	1.10e-04	1.144	0.2
50	0.14	19.6	7.77e-05	0.992	0.6
60	0.13	17.3	6.08e-05	0.885	0.2

Comments
The preferred vertical slip rate is the average of 24 m of offset on middle Pleistocene deposits that are 130-500 ka (Collins and others, 1996). 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. Collins, E.W., Raney, J.A., Machette, M.N., Haller, K.M., and Dart, R.L., 1996, Map and data for Quaternary faults in West Texas and adjacent parts of Mexico: U.S. Geological Survey Open-File Report 96-002, 74 p., 1 pl., scale 1:500,000.

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.
Collins, E.W., Raney, J.A., Machette, M.N., Haller, K.M., and Dart, R.L., 1996, Map and data for Quaternary faults in West Texas and adjacent parts of Mexico: U.S. Geological Survey Open-File Report 96-002, 74 p., 1 pl., scale 1:500,000.