2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
Eagle Bay fault	Wyoming

GEOMETRY
Dip (degrees)	40/60/50
Dip direction	E
Sense of slip	normal
Rupture top (km)	0
Rupture bottom (km)	15
Rake (degrees)	-90
Length (km)	32

MODEL VALUES
Probability of activity	1
Minimum magnitude	6.5
Maximum magnitude	6.82
b-value	0.8

Assigned Dip	Fault-Parallel Slip Rate	Width	Annual Rate	a-value	Branch Weight
40	0.75	23.3	8.71e-04	1.901	0.2
50	0.63	19.6	6.13e-04	1.749	0.6
60	0.55	17.3	4.80e-04	1.642	0.2

Comments
The preferred vertical slip rate is based on 300 m of vertical offset of the 0.63 Ma Lava Creek Tuff in the southern section of the fault. Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Selected References
Locke, W.W., Meyer, G.A., and Pings, J.C., 1992, Morphology of a postglacial fault scarp across the Yellowstone (Wyoming) caldera margin and its implications: Bulletin of the Seismological Society of America, v. 82, p. 511-516. 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

Locke, W.W., Meyer, G.A., and Pings, J.C., 1992, Morphology of a postglacial fault scarp across the Yellowstone (Wyoming) caldera margin and its implications: Bulletin of the Seismological Society of America, v. 82, p. 511-516.
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.