2008 National Seismic Hazard Maps - Source Parameters

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Fault Name	State
Abert Rim fault	Oregon

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)	45

MODEL VALUES
Probability of activity	1
Minimum magnitude	6.5
Maximum magnitude	7.00
b-value	0.8

Assigned Dip	Fault-Parallel Slip Rate	Width	Annual Rate	a-value	Branch Weight
40	0.78	23.3	6.98e-04	2.006	0.2
50	0.65	19.6	4.92e-04	1.854	0.6
60	0.58	17.3	3.85e-04	1.747	0.2

Comments
The assigned vertical slip rate is from Pezzopane (1993) and Pezzopane and Weldon (1993). They cite an estimated age of 16 ka and offset measurements of 8 m in latest Pleistocene pluvial deposits to calculate a slip rate of 0.5 mm/yr. Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Selected References

Pezzopane, S.K., and Weldon, R.J., II, 1993, Tectonic role of active faulting in central Oregon: Tectonics, v. 12, p. 1140-1169. Pezzopane, S.K., 1993, Active faults and earthquake ground motions in Oregon: Eugene, Oregon, University of Oregon, unpublished Ph.D. dissertation, 208 p. Lund, W.R., ed., 2006, Basin and Range Province Earthquake Working Group seismic-hazard recommendations to the U.S. Geological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.