2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
Eastern Bear Lake fault	Idaho

GEOMETRY
Dip (degrees)	40/60/50
Dip direction	W
Sense of slip	normal
Rupture top (km)	0
Rupture bottom (km)	15
Rake (degrees)	-90
Length (km)	81

MODEL VALUES
Probability of activity	1
Minimum magnitude	6.5
Maximum magnitude	7.29
b-value	0.8

Assigned Dip	Fault-Parallel Slip Rate	Width	Annual Rate	a-value	Branch Weight
40	0.93	23.3	5.47e-04	1.915	0.2
50	0.78	19.6	3.85e-04	1.762	0.6
60	0.69	17.3	3.01e-04	1.656	0.2

Comments
Preferred vertical slip rate is consensus value reported by Lund (2005) based on original investigation by McCalpin (2003). Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Selected References
Lund, W.R., 2005, Consensus preferred recurrence interval and vertical slip rate estimates—Review of Utah paleoseismic-trenching data by the Utah Quaternary Fault Parameters Working Group: Utah Geological Survey Bulletin 134, compact disk. McCalpin, J.P., 2003, Neotectonics of the Bear Lake Valley, Utah and Idaho; A preliminary assessment: Utah Geological Survey Miscellaneous Publication 03-4, 43 p., http://ugspub.nr.utah.gov/publications/misc_pubs/MP-03-4.pdf. 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

Lund, W.R., 2005, Consensus preferred recurrence interval and vertical slip rate estimates—Review of Utah paleoseismic-trenching data by the Utah Quaternary Fault Parameters Working Group: Utah Geological Survey Bulletin 134, compact disk.
McCalpin, J.P., 2003, Neotectonics of the Bear Lake Valley, Utah and Idaho; A preliminary assessment: Utah Geological Survey Miscellaneous Publication 03-4, 43 p., http://ugspub.nr.utah.gov/publications/misc_pubs/MP-03-4.pdf.
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.