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Simultaneous simulation of the three components of seismic accelerograms at locations around seismological stations

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Abstract

This paper proposes a new numerical procedure, based on an evolutionary optimization algorithm, for the simultaneous generation of the three components of the seismic ground acceleration at sites in the vicinity of recording stations. Different from other studies proposed to simulate only one component of the seismic excitation, in this paper, the three components are generated simultaneously in a single stage. The methodology allows the determination of a train of seismic waves, modeled as Morlet’s wavelets, that are next used for the generation of ground acceleration components. The parameters of each wave, i.e., amplitude, frequency, duration, time of arrival, and direction, are determined using an evolutionary optimization algorithm. The seismic wave train is validated by comparison with the recorded accelerograms and respective response spectra. Next, these same seismic waves are used for the simultaneous simulation of the three seismic acceleration time histories at locations on the surface close to the seismic station. The results suggest that the proposed methodology can be used for engineering applications in which the ground motion must be specified at various points, for instance in the case of electric power transmission lines or at bridge supports. Highlights: A complete methodology to simultaneously generate the 3 components of seismic accelerograms is proposed in this work. A train of seismic waves is obtained, via Morlet’s wavelets, which allows simulating accelerograms at different points. The results showed that the proposed method is a simple and effective tool that can be used in practical situations.

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Adapted from Civicioglu (2013)

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Funding

The authors acknowledge the financial support of Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES).

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Correspondence to Letícia Fleck Fadel Miguel.

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The authors declare no competing interests.

Availability of data, material, and codes

Accelerograms can be obtained from the Engineering Strong-Motion database at https://esm.mi.ingv.it (last accessed April 2021).

All data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.

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Chiesa, D.D., Miguel, L.F.F. & Riera, J.D. Simultaneous simulation of the three components of seismic accelerograms at locations around seismological stations. J Seismol 25, 1361–1384 (2021). https://doi.org/10.1007/s10950-021-10050-z

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  • DOI: https://doi.org/10.1007/s10950-021-10050-z

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