2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
Algodones fault zone	Arizona

GEOMETRY
Dip (degrees)	60/40/50
Dip direction	NE
Sense of slip	normal
Rupture top (km)	0
Rupture bottom (km)	15
Rake (degrees)	-90
Length (km)	19

MODEL VALUES
Probability of activity	1
Minimum magnitude	6.5
Maximum magnitude	6.57
b-value	0.8

Assigned Dip	Fault-Parallel Slip Rate	Width	Annual Rate	a-value	Branch Weight
40	0.23	23.3	3.90e-04	1.871	0.2
50	0.20	19.6	2.74e-04	1.719	0.6
60	0.17	17.3	2.15e-04	1.612	0.2

Comments
Preferred vertical slip rate is based on study by Woodward-McNeil and Associates (1974) that states that scarps are 7-15 m high on Upper Mesa deposits, which soil development indicates to be 50-100 k.y. Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Selected References
Woodward-McNeil & Associates, 1974, Geotechnical investigation, Yuma Dual-Purpose Nuclear Plant, Yuma, Arizona, Appendices E and F: Unpublished Report to the Salt River Project, Phoenix, Arizona. 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

Woodward-McNeil & Associates, 1974, Geotechnical investigation, Yuma Dual-Purpose Nuclear Plant, Yuma, Arizona, Appendices E and F: Unpublished Report to the Salt River Project, Phoenix, Arizona.
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.