2008 National Seismic Hazard Maps - Fault Parameters

2007 National Seismic Hazard Maps-Fault parameters
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Fault Name State
Big Chino fault Arizona
MODEL VALUES
Slip rate (vertical or horizontal in mm/yr) 0.083
Probability of activity 1
Minimum magnitude 6.5
Maximum magnitude 7.04
FAULT GEOMETRY
Dip (degrees) 60/50/40
Dip direction SW
Sense of slip normal
Rupture top (km) 0
Rupture bottom (km) 15
Rake (degrees) -90
Length (km) 49
Assigned Dip Fault Parallel Slip Rate Width Characteristic Magnitude Characteristic Rate Weight
40 0.13 23.3 7.04 1.08E-04 0.2
50 0.11 19.6 7.04 7.59E-05 0.6
60 0.1 17.3 7.04 5.94E-05 0.2
Comments
The preferred vertical slip rate is based on upper Pleistocene alluvial deposits (estimated 80-100 ka) that trenching showed to be offset vertically 7-8 m (Euge and others, 1992). Dip of fault changed to 50° based on redefined regional default value (Lund, 2006).
Selected References
Pearthree, P.A., Menges, C.M., and Mayer, L., 1983, Distribution, recurrence, and possible tectonic implications of late Quaternary faulting in Arizona: Arizona Bureau of Geologic Mineral Technical Open-File Report 83-20, 51 p.
Euge, K.M., Schell, B.A., and Lam, I.P., 1992, Development of seismic acceleration maps for Arizona: Arizona Department of Transportation Report AZ92-344, 327 p., 5 sheets, scale 1:1,000,000.
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.