2008 National Seismic Hazard Maps-Fault parameters
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Fault Name State
Sheep Basin fault Nevada
GEOMETRY
Dip (degrees) 40/60/50
Dip direction W
Sense of slip normal
Rupture top (km) 0
Rupture bottom (km) 15
Rake (degrees) -90
Length (km) 22
MODEL VALUES
Probability of activity 1
Minimum magnitude 6.5
Maximum magnitude 6.65
b-value 0.8
Assigned Dip Fault-Parallel Slip Rate Width Annual Rate a-value Branch Weight
40 0.07 23.3 1.01e-04 1.077 0.2
50 0.06 19.6 7.14e-05 0.924 0.6
60 0.05 17.3 5.59e-05 0.818 0.2
Comments
This fault was added in 2002 based on dePolo's (1998) reevaluation of field data presented by Longwell (1930). Longwell (1930) reported the presence of a 34-m-high scarp, from which dePolo (1998) determines a preferred vertical offset of 22 m. The scarp is on a deposit assumed to be 500 ka.