2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
Paulina Marsh fault	Oregon

GEOMETRY
Dip (degrees)	50
Dip direction	SW
Sense of slip	normal
Rupture top (km)	0
Rupture bottom (km)	15
Rake (degrees)	-90
Length (km)	10

MODEL VALUES
Probability of activity	1
Minimum magnitude	n/a
Maximum magnitude	6.26
b-value	n/a

Assigned Dip	Fault-Parallel Slip Rate	Width	Annual Rate	a-value
50	0.38	19.6	8.41e-04	n/a

Comments
The assigned slip rate is based on the maximum scarp height of 2 m measured along the fault and a maximum age of 6.8 ka, based on the probable presence of the Mazama ash in offset deposits (Pezzopane, 1993 #3544). 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Pezzopane, S.K., 1993, Active faults and earthquake ground motions in Oregon: Eugene, Oregon, University of Oregon, unpublished Ph.D. dissertation, 208 p. Lund, W.R., ed., 2006, Basin and Range Province Earthquake Working Group seismic-hazard recommendations to the U.S. Geological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Pezzopane, S.K., 1993, Active faults and earthquake ground motions in Oregon: Eugene, Oregon, University of Oregon, unpublished Ph.D. dissertation, 208 p.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.