2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
Pine Valley graben fault system, Halfway-Posey Valley section	Oregon

GEOMETRY
Dip (degrees)	50
Dip direction	NE
Sense of slip	normal
Rupture top (km)	0
Rupture bottom (km)	15
Rake (degrees)	-90
Length (km)	38

MODEL VALUES
Probability of activity	1
Minimum magnitude	6.5
Maximum magnitude	6.91
b-value	0.8

Assigned Dip	Fault-Parallel Slip Rate	Width	Annual Rate	a-value
50	0.01	19.6	8.96e-06	0.014

Comments
The assigned vertical slip rate is based on the two higher probability rates given by Geomatrix Consultants, Inc. (1995); they estimated 0.005 mm/yr (probability of 0.4), 0.01 mm/yr (probability of 0.4), and 0.05 mm/yr (probability of 0.2). Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Selected References
Pezzopane, S.K., 1993, Active faults and earthquake ground motions in Oregon: Eugene, Oregon, University of Oregon, unpublished Ph.D. dissertation, 208 p. Lund, W.R., ed., 2006, Basin and Range Province Earthquake Working Group seismic-hazard recommendations to the U.S. Geological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.

Selected References

Pezzopane, S.K., 1993, Active faults and earthquake ground motions in Oregon: Eugene, Oregon, University of Oregon, unpublished Ph.D. dissertation, 208 p.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.