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

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Presentation on theme: "Ground Motion Scaling Based on 1-D Rock Simulations N. Abrahamson NGA Workshop #5 March 24, 2004."— Presentation transcript:

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

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 Extrapolation M6.5, Ave Stress-drop

10 Period Extrapolation M7.0, Ave Stress-drop

11 Period Extrapolation M7.5, Ave Stress-drop

12 Period Extrapolation M7.8, Ave Stress-drop

13 Period Extrapolation M8.2, 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

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

30

31 Distance Extrap (M7.0, PGA)

32

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

34

35

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

37

38 Distance Extrap (M7.8, PGA)

39

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

41

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

43

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

51 Directivity Scaling, M7.0 T=5 sec

52 Directivity Scaling, M7.5 T= 3 sec

53 Directivity Scaling, M7.5 T=5 sec

54 FN/FP Scaling, M7.5 T=5 sec


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