Depth Dependent Site Factors in the Mississippi Embayment

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Depth Dependent Site Factors in the Mississippi
Embayment
Youssef Hashash Professor, Geotechnical
Group Department of Civil and Environmental
Engineering University of Illinois at
Urbana-Champaign
NGA-East Geotechnical Working Group Oct 1st 2009
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Part VI Soil column depth dependent seismic
site coefficients and hazard maps for the upper
Mississippi Embayment
PSHA-NL (Park and Hashash, 2005)
Fig 6-1 Page 177
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Finite fault model
Fig 6-15 Page 191
Fig 6-4 Page 180
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PSHA w/ Nonlinear Site Effects Step 1 Site
Selection
Fig 6-2 Page 178
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PSHA w/ Nonlinear Site Effects Step 2
Incorporate finite fault model
Gridded sources Gridded sources Gridded sources
Attenuation relation adopted in 2002 USGS map Park and Hashash (2005) Proposed method (this thesis)
Toro et al (0.286w) Frankel et al. (0.286w) Atkinson and Boore (0.286w) Campbell ( 0.142w) Single corner model (0.5w) Double corner model (0.5w) Single corner model (0.286w) Single corner model (0.286w) Double corner model (0.286w) Single corner model (0.143w)
Characteristic sources Characteristic sources Characteristic sources
Attenuation relation adopted in 2002 USGS map Park and Hashash (2005) Proposed method (this thesis)
Toro et al (0.25w) Frankel et al. (0.25w) Atkinson and Boore (0.25w) Campbell (0.125w) Somerville et al. (0.125w) Single corner model (0.5w) Double corner model (0.5w) Finite fault model (0.25w) Finite fault model (0.25w) Finite fault model (0.25w) Finite fault model (0.125w) Finite fault model (0.125w)
PSHA-NL(PS)
PSHA-NL(FF)
Table 6-1 Page 171
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PSHA w/ Nonlinear Site Effects Step 2 PSHA
at B/C, Ground motion TS
Fig 6-19 Page 195
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PSHA w/ Site Effects Step 3 Nonlinear site
response analysis
Table 6-5 Page 175
Shear Wave velocity Profiles Dynamic Soil Properties Weight (No. of Sumulation)
Uplands ME properties 0.75w (22)
Uplands EPRI properties 0.25w (8)
Lowlands ME properties 0.75w (22)
Lowlands EPRI properties 0.25w (8)
Table 6-6 Page 175
Shear Wave Velocity Profiles Soil column Depth (m) Sites
Uplands Low land 30, 100, 200, 300, 500, 1000 1, 2, 3, 4, 5, 6, 7, 8, 9
30 profiles
DEEPSOIL
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PSHA w/ Site Effects Step 4 Development of
Site Coefficients
Fig 6-22 Page 198
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PSHA w/ Site Effects Proposed Site
Coefficients
Table 6-7Page 167
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PSHA w/ Site Effects Proposed Site
Coefficients
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PSHA w/ Site Effects Modified hazard map of
UME
2 in 50 year
Figure 6-26 Page 202
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PSHA w/ Site Effects Comparison of hazard map
of UME
2 in 50 year
Figure 6-29 Page 205