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Engineering Perspective on Application of Simulated Ground Motions

Engineering Perspective on Application of Simulated Ground Motions. Jonathan P. Stewart & Emel Seyhan University of California, Los Angeles Robert W. Graves USGS Pasadena. Outline. Need for verification, validation, and calibration (VVC) Validation procedures

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Engineering Perspective on Application of Simulated Ground Motions

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  1. Engineering Perspective on Application of Simulated Ground Motions Jonathan P. Stewart & Emel Seyhan University of California, Los Angeles Robert W. Graves USGS Pasadena

  2. Outline • Need for verification, validation, and calibration (VVC) • Validation procedures • Validation of ShakeOut motions • Calibration of high frequency IMs from Graves-Pitarka hybrid procedure

  3. Need for VVC • Verification: consistency of motions across computational platforms for common conditions ShakeOut: example vel.(t) Bielak et al., 2010

  4. Need for VVC • Verification • Validation: results of analysis generally consistent with recordings

  5. Need for VVC • Verification • Validation • Calibration: adjustment of parameters to achieve desired attribute of simulated motions

  6. Validation Procedures • Waveform comparison using earthquake data Graves and Pitarka, 2010

  7. Validation Procedures • Waveform comparison using earthquake data • IM comparison to earthquake data Closest Distance (km) Graves and Pitarka, 2010

  8. Validation Procedures • Waveform comparison using earthquake data • IM comparison to earthquake data • IM comparison to GMPEs Frankel, 2009

  9. ShakeOut Validation • Motions from hybrid procedure

  10. ShakeOut Validation • Motions from hybrid procedure • Analysis of residuals • 4 NGA GMPEs • R, Vs30, Z for site i

  11. ShakeOut Validation • Motions from hybrid procedure • Analysis of residuals • Too-fast distance attenuation SO R PH R Star et al., 20xx

  12. ShakeOut Validation • Motions from hybrid procedure • Analysis of residuals • Too-fast distance attenuation • Too-low intra-event standard deviation Star et al., 20xx

  13. Calibration • Adjustment to high frequency component of hybrid procedure

  14. Calibration • Adjustment to high frequency component of hybrid procedure • Increase Q to slow distance attenuation Seyhan et al., 20xx

  15. Calibration • Adjustment to high frequency component of hybrid procedure • Increase Q to slow distance attenuation Seyhan et al., 20xx

  16. Calibration • Adjustment to high frequency component of hybrid procedure • Increase Q to slow distance attenuation • Randomize Fourier amplitude spectra sA = f(M) Seyhan et al., 20xx

  17. Calibration • Adjustment to high frequency component of hybrid procedure • Increase Q to slow distance attenuation • Randomize Fourier amplitude spectra Seyhan et al., 20xx

  18. Conclusions • Engineers want to use simulated motions • Needed for conditions having sparse data • Verification – Validation – Calibration • Each step documented • Avoid circularity in use of data

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