2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
Zia fault	New Mexico

GEOMETRY
Dip (degrees)	60/50/40
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	6.84
b-value	0.8

Assigned Dip	Fault-Parallel Slip Rate	Width	Annual Rate	a-value	Branch Weight
40	0.06	23.3	6.64e-05	0.806	0.2
50	0.05	19.6	4.68e-05	0.654	0.6
60	0.04	17.3	3.66e-05	0.547	0.2

Comments
The assigned vertical slip rate is based on Kelley (1977), who reports that the 1.6 Ma Santa Fe Group is offset as much as 200 ft (61 m). Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Selected References
Kelley, V.C., 1977, Geology of Albuquerque basin, New Mexico: New Mexico Bureau of Mines and Mineral Resources Memoir 33, 60 p., 2 pls. 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, ugspub.nr.utah.gov/publications/open_file_reports/OFR-477.pdf. McCalpin, J.P., and Harrison, J.B.J., 2001, Paleoseismicity of Quaternary faults near Albuquerque, New Mexico: Final Technical Report, Second Year, to U.S. Geological Survey for Contract 99HQGR0056, 58 p.

Selected References

Kelley, V.C., 1977, Geology of Albuquerque basin, New Mexico: New Mexico Bureau of Mines and Mineral Resources Memoir 33, 60 p., 2 pls.
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, ugspub.nr.utah.gov/publications/open_file_reports/OFR-477.pdf.
McCalpin, J.P., and Harrison, J.B.J., 2001, Paleoseismicity of Quaternary faults near Albuquerque, New Mexico: Final Technical Report, Second Year, to U.S. Geological Survey for Contract 99HQGR0056, 58 p.