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- Title
Nonlocal period parameters of frequency content characterization for near-fault ground motions.
- Authors
Yang, Dixiong; Wang, Wei
- Abstract
SUMMARY This paper focuses on the frequency property analysis of near-fault ground motions with and without distinct pulses, separately from the Chi-Chi and Northridge earthquakes. Ten scalar period parameters of ground motions, especially several nonlocal period parameters, are considered. Two new nonlocal parameters, namely the mean period of Hilbert marginal spectrum ( Tmh) and the improved characteristic period ( Tgi), are suggested. Moreover, comprehensive comparison and analysis indicate that Tmh, Tgi and Tavg (average spectral period) can distinguish the low-frequency components of near-fault ground motions; Tm (mean period of Fourier amplitude spectrum) and To (smoothed spectral predominant period) represent the moderate- and high-frequency components, respectively. The variance coefficient of predominant instantaneous frequency of Hilbert spectrum ( Hcov) can be regarded as an alternative index to measure the non-stationary degree of near-fault ground motions. Finally, the velocity pulses and earthquake magnitude remarkably affect the frequency parameters of near-fault ground motions. Copyright © 2012 John Wiley & Sons, Ltd.
- Subjects
FREQUENCIES of oscillating systems; CHI-chi Earthquake, Taiwan, 1999; NORTHRIDGE Earthquake, Calif., 1994; SCALAR field theory; EARTHQUAKE magnitude measurement; GEOLOGIC faults
- Publication
Earthquake Engineering & Structural Dynamics, 2012, Vol 41, Issue 13, p1793
- ISSN
0098-8847
- Publication type
Article
- DOI
10.1002/eqe.2157