Download presentation

Presentation is loading. Please wait.

Published byDeclan England Modified over 2 years ago

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

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)

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

31
Distance Extrap (M7.0, PGA)

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

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

38
Distance Extrap (M7.8, PGA)

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

42
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

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

Similar presentations

OK

Preliminary Models for PGA and 1-Sec Spectral Acceleration B. Chiou and R. Youngs (NGA Workshop, December 3, 2004)

Preliminary Models for PGA and 1-Sec Spectral Acceleration B. Chiou and R. Youngs (NGA Workshop, December 3, 2004)

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google