2008 National Seismic Hazard Maps - Fault Parameters

2007 National Seismic Hazard Maps-Fault parameters
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Fault Name State
Blacktail fault Montana
MODEL VALUES
Slip rate (vertical or horizontal in mm/yr) 0.03
Probability of activity 1
Minimum magnitude 6.5
Maximum magnitude 6.94
FAULT 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) 40
Assigned Dip Fault Parallel Slip Rate Width Characteristic Magnitude Characteristic Rate Weight
40 0.05 23.3 6.94 4.51E-05 0.2
50 0.04 19.6 6.94 3.17E-05 0.6
60 0.03 17.3 6.94 2.48E-05 0.2
Comments
The preferred vertical slip rate is based on data presented by Stickney and Bartholomew (1987) and Bartholomew and others (1999) that suggest there is 4-5 m of offset of inferred upper (<150 ka) Quaternary deposits. Dip of fault changed to 50° based on redefined regional default value (Lund, 2006).
Selected References
Stickney, M.C., and Bartholomew, M.J., 1987, Seismicity and late Quaternary faulting of the northern Basin and Range province, Montana and Idaho: Bulletin of the Seismological Society of America, v. 77, p. 1602-1625.
Bartholomew, M.J., Stickney, M.C., and Wasklewicz, T.A., 2004, Interaction between the northern Basin and Range and the Yellowstone stress fields near the Red Rock Fault, southwestern Montana: Geological Society of America Abstracts with Programs, v. 36, no. 4, p. 12.
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.