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- Title
An Empirical Model to Account for Spectral Amplification of Pulse-Like Ground Motion Records.
- Authors
Sgobba, Sara; Lanzano, Giovanni; Pacor, Francesca; Felicetta, Chiara
- 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.
- Subjects
EARTHQUAKE hazard analysis; SPECTRAL sensitivity; MOTION; HOTEL suites
- Publication
Geosciences (2076-3263), 2021, Vol 11, Issue 1, p15
- ISSN
2076-3263
- Publication type
Article
- DOI
10.3390/geosciences11010015