03/24/2004NGA Workshop: Validation1 BROADBAND SIMULATION METHODOLOGY: A HYBRID DETERMINISTIC AND STOCHASTIC APPROACH  Use Deterministic Methodology at.

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Presentation transcript:

03/24/2004NGA Workshop: Validation1 BROADBAND SIMULATION METHODOLOGY: A HYBRID DETERMINISTIC AND STOCHASTIC APPROACH  Use Deterministic Methodology at Low Frequencies (f < 1 Hz)  Use Stochastic Methodology at High Frequencies (f > 1 Hz)  Apply Site-specific Amplification Factors Based on Vs30  Combine using matched filters (1 Hz) and summing in time domain Robert Graves, Arben Pitarka, Nancy Collins, and Paul Somerville URS Corporation

03/24/2004NGA Workshop: Validation2 Deterministic Methodology (f < 1 Hz)

03/24/2004NGA Workshop: Validation3 Stochastic Methodology (f > 1 Hz)

03/24/2004NGA Workshop: Validation4 Site Amplification Factors (Borcherdt, 1994) Applied in Fourier domain, although strictly defined for response spectra. FvFv FaFa

03/24/2004NGA Workshop: Validation5 TpTp TrTr A h Source Rupture Model - slip distribution - rupture time- slip velocity function

03/24/2004NGA Workshop: Validation Northridge Mw strong motion recordings at 69 sites- complex basin geology (SCEC v2.2b) - slip distribution after Hartzell et al. (1996)

03/24/2004NGA Workshop: Validation7 Site type C Site type DSite type B Time History Comparison

03/24/2004NGA Workshop: Validation8 Observed and Simulated PGA and PGV

03/24/2004NGA Workshop: Validation9 Model Bias and Standard Error: Response Spectra Residuals vs. distance / site type Global goodness-of-fit (38 sites, avg. horizontal) Average horizontal without site factors

03/24/2004NGA Workshop: Validation10 Residuals show no significant azimuthal trends (slight over-prediction in SF valley)

03/24/2004NGA Workshop: Validation Loma Prieta Mw strong motion recordings at 32 sites- lateral velocity change across SAF - slip distribution after Wald et al. (1991)

03/24/2004NGA Workshop: Validation12 Site type BC Site type DSite type C Time History Comparison

03/24/2004NGA Workshop: Validation13 Observed and Simulated PGA and PGV

03/24/2004NGA Workshop: Validation14 Model Bias and Standard Error: Response Spectra Residuals vs. distance / site type Global goodness-of-fit (32 sites, avg. horizontal) Average horizontal

03/24/2004NGA Workshop: Validation15 Residuals show no significant azimuthal trends (over-prediction in Gilroy at longer periods)

03/24/2004NGA Workshop: Validation16 CONCLUSIONS