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Spectral Amplification Effects at Sellano, Central Italy, for the 1997–98 Umbria Seismic Sequence

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  • Concettina Nunziata
  • Maddalena Natale

Abstract

The seismic events recorded at two accelerographs installed at Sellano (central Italy) during the 1997–1998 Umbria seismic sequence, one on detritic material, at the historical centre, and the other one on rock, about 200 m distant, were analysed in terms of spectral amplification of the historical centre site. Epicentres were mainly concentrated in the north and south-east directions of Sellano area. The SH wave component average amplifications were evaluated from the smoothed Fourier spectral ratios of the recordings on soil and rock sites, along the two main epicentral lines. Similar amplifications resulted, with two main peaks in the frequency range of 3–5 Hz, corresponding to the eigenfrequencies of the damaged buildings. Shear velocities of the shallowest 30 m of soils were obtained by FTAN measurements along refraction seismic spreadings, and utilized to compute spectral amplification of soil station to rock station along the geological cross sections. A good agreement was found between observed Fourier spectral ratios and the computed 2D amplification modelling, which explains the damage level of the historical buildings beside the degraded conditions of brick masonry. Copyright Kluwer Academic Publishers 2004

Suggested Citation

  • Concettina Nunziata & Maddalena Natale, 2004. "Spectral Amplification Effects at Sellano, Central Italy, for the 1997–98 Umbria Seismic Sequence," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 33(3), pages 365-378, November.
    • Handle: RePEc:spr:nathaz:v:33:y:2004:i:3:p:365-378
    DOI: 10.1023/B:NHAZ.0000048463.15620.86
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    Cited by:

    1. Andrej Gosar, 2012. "Determination of masonry building fundamental frequencies in five Slovenian towns by microtremor excitation and implications for seismic risk assessment," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 62(3), pages 1059-1079, July.

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