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Ground Motion Scaling Based on 1-D Rock Simulations

Ground Motion Scaling Based on 1-D Rock Simulations. N. Abrahamson NGA Workshop #5 March 24, 2004. Issues to be Addressed by 1-D Rock Simulations. Period Extrapolation: to T=10 sec Mag Extrapolation: to M8.5 (SS) Distance Extrapolation: to 200 km Distance Extrapolation: to 0 km

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Ground Motion Scaling Based on 1-D Rock Simulations

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  1. Ground Motion Scaling Based on 1-D Rock Simulations N. Abrahamson NGA Workshop #5 March 24, 2004

  2. Issues to be Addressed by 1-D Rock Simulations • Period Extrapolation: to T=10 sec • Mag Extrapolation: to M8.5 (SS) • Distance Extrapolation: to 200 km • Distance Extrapolation: to 0 km • Stress-Drop Scaling • Directivity Scaling • Shallow Slip Effects • HW/FW Effects

  3. Strike-Slip Simulations

  4. Dip-Slip Simulations

  5. Strike-Slip Simulations

  6. Strike-Slip Simulations

  7. Dip-Slip Simulations

  8. Period Extrapolation • Normalize by T=2 spectral value for each simulation • Plot scaling of normalized spectra vs period

  9. Period ExtrapolationM6.5, Ave Stress-drop

  10. Period ExtrapolationM7.0, Ave Stress-drop

  11. Period ExtrapolationM7.5, Ave Stress-drop

  12. Period ExtrapolationM7.8, Ave Stress-drop

  13. Period ExtrapolationM8.2, ave stress-drop for 4/3 scaling

  14. Mag Extrapolation • Removed distance dependence (over 0-100 km) using simple model for M=7 case • Evaluate residuals • Residuals will contain mag scaling from the reference M7 case

  15. Remove distance attenuation (based on simply model)

  16. Mag Extrapolation (D< 100 km)pga, Constant stress-drop model

  17. Mag Extrapolation (D< 100 km)T=0.1 sec, Constant stress-drop model

  18. Mag Extrapolation (D< 100 km)T=0.2 sec, Constant stress-drop model

  19. Mag Extrapolation (D< 100 km)T=1 sec, Constant stress-drop model

  20. Mag Extrapolation (D< 100 km)T=3 sec,Constant stress-drop

  21. Mag Extrapolation (D< 100 km)T=10 sec, Constant stress-drop

  22. Mag Extrapolation (D< 100 km)pga, 4/3 Slope for Mag-area

  23. Mag Extrapolation (D< 100 km)T=0.2, 4/3 Slope for Mag-area

  24. Mag Extrapolation (D< 100 km)T=1 sec, 4/3 Slope for Mag-area

  25. Mag Extrapolation (D< 100 km)T=3 sec, 4/3 Slope for Mag-area

  26. Mag Extrapolation (D< 100 km)T=10 sec, 4/3 Slope for Mag-area

  27. Distance Extrap (M6.5, PGA)

  28. Distance Extrap (M6.5, PGA)

  29. Distance Extrap (M6.5, T=1)

  30. Distance Extrap (M6.5, T=1)

  31. Distance Extrap (M7.0, PGA)

  32. Distance Extrap (M7.0, PGA)

  33. Distance Extrap (M7.0, T=0.2)

  34. Distance Extrap (M7.0, T=0.2)

  35. Distance Extrap (M7.0, T=0.2)

  36. Distance Extrap (M7.0, T=1)

  37. Distance Extrap (M7.0, T=1)

  38. Distance Extrap (M7.8, PGA)

  39. Distance Extrap (M7.8, PGA)

  40. Distance Extrap (M7.8, T=0.2)

  41. Distance Extrap (M7.8, T=0.2)

  42. Distance Extrap (M7.8, T=1)

  43. Distance Extrap (M7.8, T=1)

  44. Stress-Drop Scaling (M6.5, PGA)

  45. Stress-Drop Scaling (M6.5, T=1)

  46. Stress-Drop Scaling (M6.5, T=10)

  47. Stress-Drop Scaling (M7.5, PGA)

  48. Stress-Drop Scaling (M7.5, T=1)

  49. Stress-Drop Scaling (M7.5, T=10)

  50. Directivity Scaling, M7.0 T=3 sec

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