2008 National Seismic Hazard Maps - Fault Parameters

2007 National Seismic Hazard Maps-Fault parameters
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Fault Name State
Calabacillas fault New Mexico
MODEL VALUES
Slip rate (vertical or horizontal in mm/yr) 0.007
Probability of activity 1
Minimum magnitude 6.5
Maximum magnitude 6.83
FAULT GEOMETRY
Dip (degrees) 50/40/60
Dip direction E
Sense of slip normal
Rupture top (km) 0
Rupture bottom (km) 15
Rake (degrees) -90
Length (km) 33
Assigned Dip Fault Parallel Slip Rate Width Characteristic Magnitude Characteristic Rate Weight
40 0.01 23.3 6.83 1.24E-05 0.2
50 0.01 19.6 6.83 8.73E-06 0.6
60 0.01 17.3 6.83 6.83E-06 0.2
Comments
This fault was added in the 2007 maps. Two trenches exposed evidence of four surface ruptures at approximately 14 ka (0.1 m vertical offset), 32 ka (0.3 m), 77 ka (0.55 m), and 151 ka (0.2 m; McCalpin and Harrison, 2000). These data imply a vertical slip rate of 0.0069 mm/yr for the three earthquakes that released strain that had accumulated between 151 ka and 14 ka. McCalpin and Harrison calculated a much faster, long-term slip rate of 0.027-0.054 mm/yr from a 27 m high scarp on a 0.5-1.0 Ma surface that is not considered in our preferred vertical slip rate.
Selected References
McCalpin, J.P., and Harrison, J.B.J., 2000, Paleoseismicity of Quaternary faults near Albuquerque, New Mexico: Final Technical Report to U.S. Geological Survey for contract 99HQGR0056, 46 p., 2000, Paleoseismicity of Quaternary faults near Albuquerque, New Mexico: Final Technical Report to U.S. Geological Survey for contract 99HQGR0056, 46 p.