2008 National Seismic Hazard Maps

2008 National Seismic Hazard Maps-Fault parameters

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Fault Name	State
Joes Valley fault zone	Utah

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)	47

MODEL VALUES
Probability of activity	1
Minimum magnitude	6.5
Maximum magnitude	7.00
b-value	0.8

Assigned Dip	Fault-Parallel Slip Rate	Width	Annual Rate	a-value	Branch Weight
40	0.31	23.3	2.87e-04	1.620	0.2
50	0.26	19.6	1.02e-04	1.468	0.6
60	0.23	17.3	1.58e-04	1.361	0.2

Comments
We follow the recommendation by the Utah Quaternary Fault Parameter Working Group (Lund, 2005) to treat the Joes Valley fault zone (formerly the Joes Valley fault zone, east and west faults) as a single integrated structure and that the combined source be assigned the consensus recurrence interval of 10 k.y. (with a minimum of 5 k.y., and maximum of 50 k.y.) based on original investigation by Foley and others (1986). Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Comments

We follow the recommendation by the Utah Quaternary Fault Parameter Working Group (Lund, 2005) to treat the Joes Valley fault zone (formerly the Joes Valley fault zone, east and west faults) as a single integrated structure and that the combined source be assigned the consensus recurrence interval of 10 k.y. (with a minimum of 5 k.y., and maximum of 50 k.y.) based on original investigation by Foley and others (1986). Dip of fault changed to 50? based on redefined regional default value (Lund, 2006).

Selected References
Foley, L.L., Martin, R.A., Jr., and Sullivan, J.T., 1986, Seismotectonic study for Joes Valley, Scofield and Huntington North Dams, Emery County and Scofield Projects, Utah: U.S. Bureau of Reclamation Seismotectonic Report 86-7, 132 p., 3 pls. 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. 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

Foley, L.L., Martin, R.A., Jr., and Sullivan, J.T., 1986, Seismotectonic study for Joes Valley, Scofield and Huntington North Dams, Emery County and Scofield Projects, Utah: U.S. Bureau of Reclamation Seismotectonic Report 86-7, 132 p., 3 pls.
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.
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.