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

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Presentation transcript:

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 Validation of ShakeOut motions Calibration of high frequency IMs from Graves-Pitarka hybrid procedure

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

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

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

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

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

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

ShakeOut Validation Motions from hybrid procedure

ShakeOut Validation Motions from hybrid procedure Analysis of residuals – 4 NGA GMPEs – R, V s30, Z for site i

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

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

Calibration Adjustment to high frequency component of hybrid procedure

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

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

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

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

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