2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
La Jencia fault	New Mexico

GEOMETRY
Dip (degrees)	50/60/40
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	0.03	23.3	3.66e-05	0.547	0.2
50	0.03	19.6	2.57e-05	0.395	0.6
60	0.02	17.3	2.01e-05	0.288	0.2

Comments
The preferred vertical slip rate is based on heights of two multi-event scarps on surfaces of known ages, and from the height of a single-event scarp that ended a recurrence interval of known duration (Machette and others, 1998). Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Selected References
Machette, M.N., Personius, S.F., Kelson, K.I., Haller, K.M., and Dart, R.L., 1998, Map and data for Quaternary faults and folds in New Mexico: U.S. Geological Survey Open-File Report 98-521, 443 p., 1 pl., scale 1:750,000. 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

Machette, M.N., Personius, S.F., Kelson, K.I., Haller, K.M., and Dart, R.L., 1998, Map and data for Quaternary faults and folds in New Mexico: U.S. Geological Survey Open-File Report 98-521, 443 p., 1 pl., scale 1:750,000.
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.