2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
Klamath graben fault system (west)	Oregon

GEOMETRY
Dip (degrees)	50
Dip direction	E
Sense of slip	normal
Rupture top (km)	0
Rupture bottom (km)	15
Rake (degrees)	-90
Length (km)	51

MODEL VALUES
Probability of activity	1
Minimum magnitude	6.5
Maximum magnitude	7.06
b-value	0.8

Assigned Dip	Fault-Parallel Slip Rate	Width	Annual Rate	a-value
50	0.21	19.6	1.42e-04	1.205

Comments
Assigned vertical slip rate is based on measured offsets of 21-25 m of glacial deposits estimated to be 130-150 ka (Hawkins and others, 1989 #3548). Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Selected References
Hawkins, F.F., Foley, L.L., and LaForge, R.C., 1989, Seismotectonic study for Fish Lake and Fourmile Lake Dams, Rogue River Basin Project, Oregon: U.S. Bureau of Reclamation Seismotectonic Report 89-3, 26 p., 2 pls. 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

Hawkins, F.F., Foley, L.L., and LaForge, R.C., 1989, Seismotectonic study for Fish Lake and Fourmile Lake Dams, Rogue River Basin Project, Oregon: U.S. Bureau of Reclamation Seismotectonic Report 89-3, 26 p., 2 pls.
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.