On characteristics and prediction equations of ground motion duration using the NGA-West2 strong ground motion database

XiaoDan SUN, MiaoMiao DENG, ShiYu JIN, QianQi XU, Yu LIU, YuTing DAI

Prog Geophy ›› 2025, Vol. 40 ›› Issue (3) : 938-948.

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Prog Geophy ›› 2025, Vol. 40 ›› Issue (3) : 938-948. DOI: 10.6038/pg2025JJ0019

On characteristics and prediction equations of ground motion duration using the NGA-West2 strong ground motion database

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Abstract

Strong ground motion duration plays a critical role in evaluating the nonlinear response of structures and holds significant importance for seismic design and disaster assessment. In this paper, two types of duration, including significant duration for a given energy portion (5%~95%) and bracket duration for given thresholds (0.05 g and 0.10 g), are calculated based on selected data from the NGA-West2 strong earthquake database provided by the PEER. The dependence of duration on magnitude and rupture distance are analyzed for both types of durations, from which an inverse variation trend between significant duration and bracket duration is found. Prediction equations of duration in terms of moment magnitude, rupture distance, and site condition are established using nonlinear regression considering the random effect and validated through comparisons with related studies. Finally, the engineering application of two types of duration is discussed pros and cons.

Key words

Ground motion / Significant duration / Bracket duration / Nonlinear regression / Prediction equation

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XiaoDan SUN , MiaoMiao DENG , ShiYu JIN , et al . On characteristics and prediction equations of ground motion duration using the NGA-West2 strong ground motion database[J]. Progress in Geophysics. 2025, 40(3): 938-948 https://doi.org/10.6038/pg2025JJ0019

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