Updated predictive equations for broadband (0.01-10s) horizontal response spectra and peak ground motions, based on a global dataset of digital acceleration records
Cauzzi, Carlo ; Faccioli, Ezio ; Vanini, Manuela ; Bianchini, Aldo
In: Bulletin of Earthquake Engineering, 2015, vol. 13, no. 6, p. 1587-1612
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- Presented herein is an updated model for empirical prediction of 5%-damped elastic response spectra in the period range 0-10s, peak ground acceleration and velocity, based on a global dataset of digital acceleration records. The predictive model features saturation of the shaking parameters with both magnitude $$M_{W}$$ M W and distance $$R_{ RUP }$$ R R U P , magnitude-dependent distance attenuation, alternative parameterisations of the amplification effects due to local site conditions (based either on ground types or $$V_{S,30}$$ V S , 30 ) and corrective terms for style-of-faulting. The calibration dataset comprises more than $$1{,}880\times 2$$ 1 , 880 × 2 orthogonal horizontal accelerometer records with $$R_{ RUP }< 150$$ R R U P < 150 km from 98 global earthquakes with $$4.5\le M_{W}\le 7.9$$ 4.5 ≤ M W ≤ 7.9 . The processing technique applied to the acceleration data optimises the reliability of the predictions at long periods, as required by displacement-based design techniques. Developed independently of the recent NGA-West2 and RESORCE-based models, the new predictive tool effectively contributes to capturing the epistemic uncertainties associated with the prediction of seismic shaking levels for engineering applications.