2008 National Seismic Hazard Maps - Fault Parameters

2007 National Seismic Hazard Maps-Fault parameters

Fault Name	State
Big Flat-Jakes Creek fault	Idaho

MODEL VALUES
Slip rate (vertical or horizontal in mm/yr)	0.04
Probability of activity	1

Minimum magnitude	6.5
Maximum magnitude	6.81

FAULT GEOMETRY
Dip (degrees)	40/50/60
Dip direction	E
Sense of slip	normal
Rupture top (km)	0
Rupture bottom (km)	15
Rake (degrees)	-90
Length (km)	31

Assigned Dip	Fault Parallel Slip Rate	Width	Characteristic Magnitude	Characteristic Rate	Weight
40	0.06	23.3	6.81	7.28E-05	0.2
50	0.05	19.6	6.81	5.13E-05	0.6
60	0.05	17.3	6.81	4.01E-05	0.2

Comments




The preferred vertical slip rate is based on Gilbert and others (1983) who document 300-600 m offset of Miocene Columbia River Basalt. Dip of fault changed to 50° based on redefined regional default value (Lund, 2006).
Selected References




Gilbert, J.D., Piety, L., and LaForge, R., 1983, Seismotectonic study for Black Canyon Dam, Boise project, Idaho: U.S. Bureau of Reclamation Seismotectonic Report 83-7, 73 p., 8 pl. 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.