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Preliminary PEER-NGA Ground Motion Model

Preliminary PEER-NGA Ground Motion Model. Brian Chiou and Robert Youngs PEER-NGA Workshop April 12, 2005. Data Selection. Excluded earthquakes Gorda plate earthquakes – oceanic crust Subduction zone earthquakes Poorly known overseas earthquakes Northwest China earthquakes

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Preliminary PEER-NGA Ground Motion Model

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  1. Preliminary PEER-NGAGround Motion Model Brian Chiou and Robert Youngs PEER-NGA Workshop April 12, 2005

  2. Data Selection • Excluded earthquakes • Gorda plate earthquakes – oceanic crust • Subduction zone earthquakes • Poorly known overseas earthquakes • Northwest China earthquakes • Earthquakes recorded by SMART1 array • Aftershocks (used only in site effects analysis) • Excluded records • In basements • In large structures • On dam abutment

  3. Modeling Concepts • Source scaling • Magnitude (M, M2.5 ) • No aspect ratio • Depth (depth to the top of rupture) • Style of faulting (SS+NM vs. RV) • Aftershocks not used • Distance scaling • Closest distance to fault • Effect of Q for large distances • Break in slope at about 60 km • Hanging wall effects, function of fault dip angle

  4. Modeling Concepts (cont’d) • Site Effects • Function of VS30 (will examine effect using categories) • Nonlinear site amplification (using empirical data guided by modeling results) • Depth to VS ~ 1 km/s

  5. yr ys Model Form • Reference site motion (Vs=1130m/sec) • Site effects

  6. Amplification relative to Vs=1130 m/sec a b c ln(yr)

  7. Comparison to Site Response Analysis with EPRI Soil Property Model PGA Site Response Analysis (EPRI Soil) Regression

  8. Comparison to Site Response Analysis with Peninsula Range Soil Property Model PGA Site Response Analysis (Peninsula Rage Soil)

  9. Comparison to Site Response Analysis with EPRI Soil Property Model T=1 Sec Site Response Analysis (EPRI) Regression

  10. Comparison to Site Response Analysis with Peninsula Range Soil Property Model PGA

  11. Soft Rock, Strike Slip and Reverse PGA Strike Slip Reverse

  12. Strike Slip Soft Rock and Soil PGA

  13. Strike Slip Soil PGA and 1 Hz PSA PGA 1 Hz

  14. Inter-event Residuals Magnitude Distance

  15. PGA Intra-event Residuals Magnitude Distance

  16. 1 Hz PSA Intra-event Residuals Magnitude Distance

  17. T=3Sec

  18. T=3Sec

  19. Dip Slip Earthquakes, Records on HW/FW T=3Sec

  20. T=3Sec

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