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Site response obtained from array techniques applied to the seismic noise: Two examples in Italy

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Abstract

The vertical component of the seismic noise has been recorded in two different sites near the towns of Mercato S. Severino and Benevento in Southern Italy by a small aperture array, in order to investigate the characteristics of the noise propagation and to study the site response. Three different array techniques have been applied in the two investigated sites: Beam Forming, High Resolution and Spatial Correlation methods. We used two simple array geometry for localising possible noise sources and estimating local shallow structure using ambient noise. The cross shaped array results effective for determining the phase velocity of waves in the case when the noise is from a single localised source; the circular array, on the other hand, is successfully used when the noise sources are distributed. The main results are: the analysis of a coherent component of the noise recorded in the two sites, interpreted as Rayleigh waves, results in reasonable velocity models; the noise recorded in the M.S.S. Plain is a space stationary signal, while the noise at the Benevento site is possibly produced by a stable noise source located close to the array. Due to this evidence, the correlation method does not yield satisfactory results when applied to the Benevento site. The 2–6 Hz spectral peaks of the noise recorded in the M.S.S. Plain can be interpreted as due to a site effect, considering the satisfactory agreement of the noise spectrum at those frequencies with the theoretical transfer function computed on the basis of the velocity model deduced from the Rayleigh waves dispersion analysis.

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Authors and Affiliations

  1. Facoltà di Scienze, Università del Sannio, Benevento

    R. Maresca

  2. Osservatorio Vesuviano – Napoli; Dipartimento di Fisica –, Università di Salerno, Roma

    E. Del Pezzo

  3. Osservatorio Vesuviano, Napoli

    M. La Rocca, G. Liguori & C. Sabbarese

  4. Servizio Sismico Nazionale –, Roma

    G. Milana

Authors
  1. R. Maresca
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  2. E. Del Pezzo
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  3. M. La Rocca
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  4. G. Liguori
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  5. G. Milana
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  6. C. Sabbarese
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Maresca, R., Del Pezzo, E., La Rocca, M. et al. Site response obtained from array techniques applied to the seismic noise: Two examples in Italy. Journal of Seismology 3, 31–43 (1999). https://doi.org/10.1023/A:1009739303582

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