Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/14270
Authors: Sgobba, Sara* 
Lanzano, Giovanni* 
Pacor, Francesca* 
Felicetta, Chiara* 
Title: An Empirical Model to Account for Spectral Amplification of Pulse-Like Ground Motion Records
Journal: Geosciences 
Series/Report no.: 1/11 (2021)
Publisher: MDPI
Issue Date: 2021
DOI: 10.3390/geosciences11010015
URL: https://www.mdpi.com/2076-3263/11/1/15
Abstract: Near-source effects can amplify seismic ground motion, causing large demand to structures and thus their identification and characterization is fundamental for engineering applications. Among the most relevant features, forward-directivity effects may generate near-fault records characterized by a large velocity pulse and unusual response spectral shape amplified in a narrow frequency-band. In this paper, we explore the main statistical features of acceleration and displacement response spectra of a suite of 230 pulse-like signals (impulsive waveforms) contained in the NESS1 (NEar Source Strong-motion) flat-file. These collected pulse-like signals are analyzed in terms of pulse period and pulse azimuthal orientation. We highlight the most relevant differences of the pulse-like spectra compared to the ordinary (i.e., no-pulse) ones, and quantify the contribution of the pulse through a corrective factor of the spectral ordinates. Results show that the proposed empirical factors are able to capture the amplification effect induced by near-fault directivity, and thus they could be usefully included in the framework of probabilistic seismic hazard analysis to adjust ground-motion model (GMM) predictions.
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