2008 National Seismic Hazard Maps - Fault Parameters

2007 National Seismic Hazard Maps-Fault parameters
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Fault Name State
Amargosa fault Texas
MODEL VALUES
Slip rate (vertical or horizontal in mm/yr) 0.11
Probability of activity 1
Minimum magnitude 6.5
Maximum magnitude 7.22
FAULT GEOMETRY
Dip (degrees) 50/60/40
Dip direction NE
Sense of slip normal
Rupture top (km) 0
Rupture bottom (km) 15
Rake (degrees) -90
Length (km) 70
Assigned Dip Fault Parallel Slip Rate Width Characteristic Magnitude Characteristic Rate Weight
40 0.17 23.3 7.22 1.10E-04 0.2
50 0.14 19.6 7.22 7.77E-05 0.6
60 0.13 17.3 7.22 6.08E-05 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
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.
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.