2008 National Seismic Hazard Maps - Source Parameters

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Fault Name	State
Warner Valley faults (west)	Oregon

GEOMETRY
Dip (degrees)	60/40/50
Dip direction	E
Sense of slip	normal
Rupture top (km)	0
Rupture bottom (km)	15
Rake (degrees)	-90
Length (km)	43

MODEL VALUES
Probability of activity	1
Minimum magnitude	6.5
Maximum magnitude	6.99
b-value	0.8

Assigned Dip	Fault-Parallel Slip Rate	Width	Annual Rate	a-value	Branch Weight
40	0.17	23.3	1.53e-04	1.337	0.2
50	0.14	19.6	1.08e-04	1.184	0.6
60	0.13	17.3	8.45e-05	1.078	0.2

Comments
Preferred vertical slip rate is based on the average vertical offset of 5-8 Ma volcanic rocks that are exposed outside the graben. There, the volcanic rocks crop out 0.6-0.8 km higher than the elevation of the valley floor of the graben. Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Selected References
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.