2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
County Dump fault	New Mexico

GEOMETRY
Dip (degrees)	40/50/60
Dip direction	E
Sense of slip	normal
Rupture top (km)	0
Rupture bottom (km)	15
Rake (degrees)	-90
Length (km)	37

MODEL VALUES
Probability of activity	1
Minimum magnitude	6.5
Maximum magnitude	6.89
b-value	0.8

Assigned Dip	Fault-Parallel Slip Rate	Width	Annual Rate	a-value	Branch Weight
40	0.06	23.3	6.25e-05	0.836	0.2
50	0.05	19.6	4.40e-05	0.683	0.6
60	0.04	17.3	3.44e-05	0.577	0.2

Comments
The preferred vertical slip rate is based 16 m of section exposed by trenches that had been offset 20 m by 14 surface ruptures since 527 ka (McCalpin, 1997). Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Selected References
McCalpin, J.P., 1997, Paleoseismicity of Quaternary faults near Albuquerque, New Mexico: Technical report to U.S. Geological Survey, under Contract 1434-HQ-96-GR-02751, 18 p. 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., Olig, S.S., Harrison, J.B.J., and Berger, G.W., 2006, Quaternary faulting and soil formation on the County Dump fault, Albuquerque, New Mexico: New Mexico Bureau of Geology and Mineral Resources Circular 212, 36 p.

Selected References

McCalpin, J.P., 1997, Paleoseismicity of Quaternary faults near Albuquerque, New Mexico: Technical report to U.S. Geological Survey, under Contract 1434-HQ-96-GR-02751, 18 p.
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., Olig, S.S., Harrison, J.B.J., and Berger, G.W., 2006, Quaternary faulting and soil formation on the County Dump fault, Albuquerque, New Mexico: New Mexico Bureau of Geology and Mineral Resources Circular 212, 36 p.