2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
Calabacillas fault	New Mexico

GEOMETRY
Dip (degrees)	40/50/60
Dip direction	E
Sense of slip	normal
Rupture top (km)	0
Rupture bottom (km)	15
Rake (degrees)	-90
Length (km)	33

MODEL VALUES
Probability of activity	1
Minimum magnitude	6.5
Maximum magnitude	6.83
b-value	0.8

Assigned Dip	Fault-Parallel Slip Rate	Width	Annual Rate	a-value	Branch Weight
40	0.01	23.3	1.24e-05	0.066	0.2
50	0.01	19.6	8.73e-06	-0.086	0.6
60	0.01	17.3	6.83e-06	-0.193	0.2

Comments
This fault was added to the source model for the 2008 seismic hazard model. Activity rate is assigned based on data from a trench suggesting four surface ruptures that occurred 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 suggest a vertical-displacement rate of 0.0069 mm/yr for the three earthquakes that released strain that accumulated between 151 ka and 14 ka. McCalpin and Harrison calculated a faster, long-term vertical-displacement rate of 0.027-0.054 mm/yr from the 27-m-high scarp on a 0.5-1.0 Ma surface at the trench site. This information is not considered in our assigned vertical-displacement rate.

Comments

This fault was added to the source model for the 2008 seismic hazard model. Activity rate is assigned based on data from a trench suggesting four surface ruptures that occurred 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 suggest a vertical-displacement rate of 0.0069 mm/yr for the three earthquakes that released strain that accumulated between 151 ka and 14 ka. McCalpin and Harrison calculated a faster, long-term vertical-displacement rate of 0.027-0.054 mm/yr from the 27-m-high scarp on a 0.5-1.0 Ma surface at the trench site. This information is not considered in our assigned vertical-displacement 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.