4.7 Article

Synthetic spectral structure of the seismic ambient vibrations generated by a distribution of superficial random sources with a finite extension

Journal

SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
Volume 151, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.soildyn.2021.106949

Keywords

Seismic ambient-vibrations; Power spectra; Random wavefield; Correlated loads; HVSR

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The seismic ambient vibrations model presented utilizes a random wavefield generated by correlated aleatory forces on the surface of a flat layered weakly-dissipative Earth. The frequency-dependent spatial correlation among these sources is parametrized by considering the role of sea-wave dynamics in generating ambient vibrations, allowing for a realistic description of the average power spectral density function observed worldwide under reference soil conditions. The effectiveness of the model is demonstrated by reproducing observed average Horizontal-to-Vertical Spectral Ratios at a well documented site in Northern Italy.
A model of seismic ambient vibrations is presented in the form of a random wavefield generated by a uniform continuous distribution of correlated aleatory forces, located at the surface of a flat layered weakly-dissipative Earth. The frequency-dependent spatial correlation among these sources is assumed to be representative of their spatial extension and has been parametrized by considering the role played by sea-wave dynamics in generating ambient vibrations. This enables a realistic description of the average power spectral density function of ambient vibrations observed worldwide at reference soil conditions. Effectiveness of the model is tested by reproducing observed average Horizontal-to-Vertical Spectral Ratios obtained from ambient vibration measurements at a well documented site in Northern Italy.

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