2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
Pajarito fault	New Mexico

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)	50

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

Assigned Dip	Width	Annual Rate	a-value	Branch Weight
40	23.3	9.90e-05	1.036	0.2
50	19.6	9.90e-05	1.036	0.6
60	17.3	9.90e-05	1.036	0.2

Comments
Recent trenching and related work provide direct estimates of recurrence intervals for large, Holocene and late Pleistocene earthquakes on the Pajarito fault and, for some earthquakes, the subsidiary Rendija Canyon and Guaje Mountain faults (Gardner and others, 2005; McCalpin, 2005; J.N. Gardner, S. Olig, written and oral communs., April 2006). The mean recurrence interval used in the 2007 maps is derived from the earthquake chronology of Gardner and others, who documented evidence for four surface ruptures that are referred to here as earthquakes 1.4-2.2 ka, 4.2-6.5 ka, 9.0-10.9 ka, and approximately 39 ka. Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Comments

Recent trenching and related work provide direct estimates of recurrence intervals for large, Holocene and late Pleistocene earthquakes on the Pajarito fault and, for some earthquakes, the subsidiary Rendija Canyon and Guaje Mountain faults (Gardner and others, 2005; McCalpin, 2005; J.N. Gardner, S. Olig, written and oral communs., April 2006). The mean recurrence interval used in the 2007 maps is derived from the earthquake chronology of Gardner and others, who documented evidence for four surface ruptures that are referred to here as earthquakes 1.4-2.2 ka, 4.2-6.5 ka, 9.0-10.9 ka, and approximately 39 ka. Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Selected References
Olig, S.S., Kelson, K.I., Gardner, J.N., Reneau, S.L., and Hemphill-Haley, M., 1996, The earthquake potential of the Pajarito fault system, 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. 143-152. 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. 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. Gardner, J.N., Lewis, C.J., Lavine, A., Reneau, S.L., and Schultz, E., 2005, Evaluating seismic hazards at Los Alamos National Laboratory—Geology and paleoseismology of the Pajarito fault system, Rio Grande Rift, New Mexico: Los Alamos National Laboratory Report LA-UR-05-4662, 42 p. (36 MB Microsoft Powerpoint file). McCalpin, J.P., 2005, Late Quaternary activity of the Pajarito fault, Rio Grande rift of northern New Mexico, USA: Tectonophysics, v. 408, p. 213–236, doi:10.1016/j.tecto.2005.05.038.

Selected References

Olig, S.S., Kelson, K.I., Gardner, J.N., Reneau, S.L., and Hemphill-Haley, M., 1996, The earthquake potential of the Pajarito fault system, 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. 143-152.
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.
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.
Gardner, J.N., Lewis, C.J., Lavine, A., Reneau, S.L., and Schultz, E., 2005, Evaluating seismic hazards at Los Alamos National Laboratory—Geology and paleoseismology of the Pajarito fault system, Rio Grande Rift, New Mexico: Los Alamos National Laboratory Report LA-UR-05-4662, 42 p. (36 MB Microsoft Powerpoint file).
McCalpin, J.P., 2005, Late Quaternary activity of the Pajarito fault, Rio Grande rift of northern New Mexico, USA: Tectonophysics, v. 408, p. 213–236, doi:10.1016/j.tecto.2005.05.038.