2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
La Bajada fault	New Mexico

GEOMETRY
Dip (degrees)	60/50/40
Dip direction	W
Sense of slip	normal
Rupture top (km)	0
Rupture bottom (km)	15
Rake (degrees)	-90
Length (km)	42

MODEL VALUES
Probability of activity	1
Minimum magnitude	6.5
Maximum magnitude	6.96
b-value	0.8

Assigned Dip	Fault-Parallel Slip Rate	Width	Annual Rate	a-value	Branch Weight
40	0.12	23.3	1.15e-04	1.178	0.2
50	0.10	19.6	8.10e-05	1.026	0.6
60	0.09	17.3	6.34e-05	0.920	0.2

Comments
The preferred vertical slip rate is based on 90 m vertical offset (S.F. Personius, unpublished data, 1996) of a basaltic andesite that was deposited about 1.16 Ma (R.A. Thompson, written commun., 1998). 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. Smith, G.A., and Kuhle, A.J., 1998, Hydrostratigraphic implications of new geological mapping in the Santo Domingo basin, New Mexico: New Mexico Geology, v. 20, p. 21-27. Sawyer, D., Deszcz-Pan, M., Grauch, V.S.J., Smith, G., Dethier, D., Thompson, R., Minor, S., Shroba, R., Rodriguez, B., and Kuhle, A., 1998, Geology of the Cochiti Pueblo area and the Cerrillos uplift based upon geologic mapping, airborne and ground geophysics, and limited subsurface information, in Slate, J.L., ed., U.S. Geological Survey Middle Rio Grande basin study—Proceedings of the Second Annual Workshop, Albuquerque, New Mexico, February 10-11, 1998: U.S. Geological Survey Open-File Report 98-337, p. 17-18.

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.
Smith, G.A., and Kuhle, A.J., 1998, Hydrostratigraphic implications of new geological mapping in the Santo Domingo basin, New Mexico: New Mexico Geology, v. 20, p. 21-27.
Sawyer, D., Deszcz-Pan, M., Grauch, V.S.J., Smith, G., Dethier, D., Thompson, R., Minor, S., Shroba, R., Rodriguez, B., and Kuhle, A., 1998, Geology of the Cochiti Pueblo area and the Cerrillos uplift based upon geologic mapping, airborne and ground geophysics, and limited subsurface information, in Slate, J.L., ed., U.S. Geological Survey Middle Rio Grande basin study—Proceedings of the Second Annual Workshop, Albuquerque, New Mexico, February 10-11, 1998: U.S. Geological Survey Open-File Report 98-337, p. 17-18.