2008 National Seismic Hazard Maps - Source Parameters

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Fault Name	State
Hebgen-Red Canyon fault	Montana

GEOMETRY
Dip (degrees)	60/40/50
Dip direction	SW
Sense of slip	normal
Rupture top (km)	0
Rupture bottom (km)	15
Rake (degrees)	-90
Length (km)	25

MODEL VALUES
Probability of activity	1
Minimum magnitude	6.5
Maximum magnitude	7.30
b-value	0.8

Assigned Dip	Fault-Parallel Slip Rate	Width	Annual Rate	a-value	Branch Weight
40	0.78	23.3	1.38e-04	7.300	0.2
50	0.65	19.6	4.99e-05	1.175	0.6
60	0.58	17.3	7.59e-05	1.068	0.2

Comments
Assigned characteristic magnitude based on Hebgen Lake earthquake. Hebgen and Red Canyon faults combined into single source as recommended by Basin and Range Province Earthquake Working Group working (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.