In this section
@article{Bora:2016:10.1785/0120150129,
author = {Bora, SS and Scherbaum, F and Kuehn, N and Stafford, PJ},
doi = {10.1785/0120150129},
journal = {Bulletin of the Seismological Society of America},
title = {On the relationship between Fourier and response spectra: Implications for the adjustment of empirical ground-motion prediction equations (GMPEs)},
url = {http://dx.doi.org/10.1785/0120150129},
volume = {106},
year = {2016}
}
TY - JOUR
AB - The functional form of empirical response spectral ground-motion predictionequations (GMPEs) is often derived using concepts borrowed from Fourier spectralmodeling of ground motion. As these GMPEs are subsequently calibrated with empiricalobservations, this may not appear to pose any major problems in the prediction ofground motion for a particular earthquake scenario. However, the assumption that Fourierspectral concepts persist for response spectra can lead to undesirable consequenceswhen it comes to the adjustment of response spectral GMPEs to represent conditions notcovered in the original empirical data set. In this context, a couple of important questionsarise, for example, what are the distinctions and/or similarities between Fourier andresponse spectra of ground motions? And, if they are different, then what is the mechanismresponsible for such differences and how do adjustments that are made to Fourieramplitude spectrum (FAS) manifest in response spectra? The present article explores therelationship between the Fourier and response spectrum of ground motion by usingrandom vibration theory (RVT). With a simple Brune (1970, 1971) source model, RVTgeneratedacceleration spectra for a fixed magnitude and distance scenario are used. TheRVT analyses reveal that the scaling of low oscillator-frequency response spectral ordinatescan be treated as being equivalent to the scaling of the corresponding Fourierspectral ordinates. However, the high oscillator-frequency response spectral ordinatesare controlled by a rather wide band of Fourier spectral ordinates. In fact, the peakground acceleration, counter to the popular perception that it is a reflection of the highfrequencycharacteristics of ground motion, is controlled by the entire Fourier spectrumof ground motion. Additionally, this article demonstrates how an adjustment made toFAS is similar or different to the same adjustment made to response spectral ordinates.For this purpose, two cases: adjustments to the stres
AU - Bora,SS
AU - Scherbaum,F
AU - Kuehn,N
AU - Stafford,PJ
DO - 10.1785/0120150129
PY - 2016///
SN - 1943-3573
TI - On the relationship between Fourier and response spectra: Implications for the adjustment of empirical ground-motion prediction equations (GMPEs)
T2 - Bulletin of the Seismological Society of America
UR - http://dx.doi.org/10.1785/0120150129
UR - http://hdl.handle.net/10044/1/33011
VL - 106
ER -