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Ground Motion Modeling: Parameters, Variability, and Site Classification for Seismic Analysis

This document outlines the critical aspects of ground motion modeling, including median and standard deviation considerations. It discusses essential ground motion parameters such as peak ground acceleration (PGA), peak ground velocity (PGV), and pseudo-spectral acceleration at 5% damping for various magnitudes (5.0-8.5) and distances (0-200 km). The significance of site classification and its implications for seismic hazard assessments, along with key issues like aleatory variability and oversaturation effects, are explored. Recent model changes, including parameter dependencies related to fault types and soil characteristics, are also examined.

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Ground Motion Modeling: Parameters, Variability, and Site Classification for Seismic Analysis

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  1. Developer Scope • Ground Motion Model (median, standard dev) • Ground Motion Parameters: • Horizontal components (Ave Horiz, FN, and FP) • PGA, PGV, PGD • Pseudo spectral acc at 5% damping: 0-10 sec • Applicable Magnitude Range: • 5.0 - 8.5 (SS) • 5.0 - 8.0 (RV) • Applicable Distance Range: • 0 - 200 km • Fault Types • Strike-slip, Reverse, Normal • Site Classification Scheme • Developers select their preferred classification scheme • Need not include soft-soil

  2. Key Data Set Issues

  3. Distance Attenuation

  4. Site Terms

  5. Source Parameter Models

  6. Aleatory Variability

  7. Key Issues • Oversaturation • Is it due to the aspect ratio, or the magnitude? • Use of Aspect ratio • Are aspect ratios used in NGA consistent with aspect ratios currently used in hazard analyses? • Correlation with style-of-faulting • Dependence on dip • Is this dip effects or a regional effect?

  8. Key Changes from Previous Models • Site classification • Vs30 • Depth of soil term (Z1.0 or Z1.5) • Source • Oversaturation with magnitude • Aspect ratio as a key parameter • Non-linear site response • Based on median rock PGA including event term

  9. C&Y, SS, Vs=600

  10. C&B (M1) SS, Vs=600

  11. A&S, SS, AR<=2, Vs=600

  12. A&S, SS, Vs=600

  13. M6, SS, Vs=600

  14. M7, SS, Vs=600

  15. M8, SS, Vs=600

  16. T=1 sec Vs=600 C&Y w/o AR

  17. T=1 sec SS Vs=600 C&B w/o AR

  18. T=1 sec SS Vs=600 A&S AR<=2

  19. T=1 sec SS Vs=600 A&S

  20. PGA - Intra-Event Variability

  21. T=1 - Intra-Event Variability

  22. T=1, Inter-Event Variability

  23. PGA - Inter-Event Variability

  24. PGA Hazard Vs=600 Site near Hayward Fault (2 km)

  25. T=1 sec Hazard Vs=600 Site near Hayward Fault (2 km)

  26. PGA Hazard Vs=600 Site near San Andreas Fault (2 km)

  27. T=1 Sec, Hazard Vs=600 Site near San Andreas Fault (2 km)

  28. Site Amplification for PGA(EPRI model)

  29. Site Amplification for PGA(Pen Range model)

  30. Site Amplification for PGA

  31. Site Amplification for PGA

  32. Site Amplification for T=1(EPRI)

  33. Site Amplification for T=1(Pen Range)

  34. Site Amplification for T=1

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