2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
Nambe fault	New Mexico

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

MODEL VALUES
Probability of activity	1
Minimum magnitude	6.5
Maximum magnitude	7.05
b-value	0.8

Assigned Dip	Fault-Parallel Slip Rate	Width	Annual Rate	a-value	Branch Weight
40	0.03	23.3	2.56e-05	0.449	0.2
50	0.03	19.6	1.81e-05	0.297	0.6
60	0.02	17.3	1.41e-05	0.191	0.2

Comments
The trace of the Nambe fault is marked by a prominent topographic escarpment. Interpretation of aerial photographs suggested a tectonic origin of the escarpment, but various field studies over the past few decades suggest a depositional origin with little or no faulting. However, Wong and others (1995, 1996) noted the absence of data indicating Quaternary faulting and assigned a distribution of fault-parallel slip rates from 0.01-0.23 mm/yr with a preferred value of 0.02 mm/yr; the value assigned for the 1996 national seismic-hazard maps. Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Comments

The trace of the Nambe fault is marked by a prominent topographic escarpment. Interpretation of aerial photographs suggested a tectonic origin of the escarpment, but various field studies over the past few decades suggest a depositional origin with little or no faulting. However, Wong and others (1995, 1996) noted the absence of data indicating Quaternary faulting and assigned a distribution of fault-parallel slip rates from 0.01-0.23 mm/yr with a preferred value of 0.02 mm/yr; the value assigned for the 1996 national seismic-hazard maps. Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Selected References
Wong, I., Kelson, K., Olig, S., Kolbe, T., Hemphill-Haley, M., Bott, J., Green, R., Kanakari, H., Sawyer, J., Silva, W., Stark, C., Haraden, C., Fenton, C., Unruh, J., Gardner, J., Reneau, S., and House, L., 1995, Seismic hazards evaluation of the Los Alamos National Laboratory: Technical report to Los Alamos National Laboratory, Los Alamos, New Mexico, February 24, 1995, 3 volumes, 12 pls., 16 appen. Wong, I., Kelson, K., Olig, S., Bott, J., Green, R., Kolbe, T., Hemphill-Haley, M., Gardner, J., Reneau, S., and Silva, W., 1996, Earthquake potential and ground shaking hazard at the Los Alamos National Laboratory, New Mexico, in Goff, F., Kues, B.S., Rogers, M.A., McFadden, L.D., and Gardner, J.N., eds., The Jemez Mountains region: New Mexico Geological Society, 47th Field Conference, September 25-28, 1996, Guidebook, p. 135–142. 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.

Selected References

Wong, I., Kelson, K., Olig, S., Kolbe, T., Hemphill-Haley, M., Bott, J., Green, R., Kanakari, H., Sawyer, J., Silva, W., Stark, C., Haraden, C., Fenton, C., Unruh, J., Gardner, J., Reneau, S., and House, L., 1995, Seismic hazards evaluation of the Los Alamos National Laboratory: Technical report to Los Alamos National Laboratory, Los Alamos, New Mexico, February 24, 1995, 3 volumes, 12 pls., 16 appen.
Wong, I., Kelson, K., Olig, S., Bott, J., Green, R., Kolbe, T., Hemphill-Haley, M., Gardner, J., Reneau, S., and Silva, W., 1996, Earthquake potential and ground shaking hazard at the Los Alamos National Laboratory, New Mexico, in Goff, F., Kues, B.S., Rogers, M.A., McFadden, L.D., and Gardner, J.N., eds., The Jemez Mountains region: New Mexico Geological Society, 47th Field Conference, September 25-28, 1996, Guidebook, p. 135–142.
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.