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Depth Dependent Site Factors in the Mississippi Embayment

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 1 st 2009.

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Depth Dependent Site Factors in the Mississippi Embayment

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  1. 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

  2. Part VI: Soil column depth dependent seismic site coefficients and hazard maps for the upper Mississippi Embayment Step 1 Select Site coordinates, site profiles, and dynamic properties Limitation of step2 Step 2 Perform PSHA for Site Class A Choose number of simulations (N in 10-year) to simulate gridded sources and characteristic sources Output: a) Suite of B/C boundary motions & UHRS, b) Suite of A motions • Both characteristic and gridded seismic sources are simulated by point source models • Point source models do not sufficiently cover the uncertainty in attenuation relations used in USGS 2002 maps (Frankel et al., 2002) No UHRS close to USGS B/C Hazard maps Change number of Simulations (N) Yes Incorporate finite fault model Step 3 Propagate the A boundary motions through site profiles using DEEPSOIL Output: a) suite of site specific motions, b) site specific UHRS Limitation of step3 • the A boundary motions are propagated through two deterministic profiles Step 4 Develop depth dependent site coefficients Randomize soil profiles PSHA-NL (Park and Hashash, 2005) Fig 6-1 Page 177

  3. Finite fault model Fig 6-15 Page 191 Fig 6-4 Page 180

  4. PSHA w/ Nonlinear Site Effects Step 1: Site Selection Fig 6-2 Page 178

  5. PSHA w/ Nonlinear Site Effects Step 2: Incorporate finite fault model Fig 6-6 Page 182 PSHA-NL(PS) PSHA-NL(FF) Table 6-1 Page 171

  6. PSHA w/ Nonlinear Site Effects Step 2: PSHA at B/C, Ground motion TS Fig 6-20 Page 196 Fig 6-19 Page 195

  7. PSHA w/ Site Effects Step 3: Nonlinear site response analysis Fig 6-17 Page 193 Table 6-5 Page 175 Table 6-6 Page 175 30 profiles DEEPSOIL

  8. PSHA w/ Site Effects Step 4: Development of Site Coefficients Fig 6-23 Page 199 Fig 6-25 Page 201 Fig 6-22 Page 198

  9. PSHA w/ Site Effects Proposed Site Coefficients Table 6-7Page 167

  10. PSHA w/ Site Effects Proposed Site Coefficients Fig 6-23 Page 199

  11. PSHA w/ Site Effects Modified hazard map of UME 0.2 sec Sa 1.0 sec Sa PGA 2% in 50 year Figure 6-26 Page 202

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