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Microzonation of Potenza (Southern Italy) in terms of spectral intensity ratio using joint analysis of earthquakes and ambient noise

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Abstract

A temporary seismic network composed of 11 stations was installed in the city of Potenza (Southern Italy) to record local and regional seismicity within the context of a national project funded by the Italian Department of Civil Protection (DPC). Some stations were moved after a certain time in order to increase the number of measurement points, leading to a total of 14 sites within the city by the end of the experiment. Recordings from 26 local earthquakes (Ml 2.2−3.8 ) were analyzed to compute the site responses at the 14 sites by applying both reference and non-reference site techniques. Furthermore, the Spectral Intensity (SI) for each local earthquake, as well as their ratios with respect to the values obtained at a reference site, were also calculated. In addition, a field survey of 233 single station noise measurements within the city was carried out to increase the information available at localities different from the 14 monitoring sites. By using the results of the correlation analysis between the horizontal-to-vertical spectral ratios computed from noise recordings (NHV) at the 14 selected sites and those derived by the single station noise measurements within the town as a proxy, the spectral intensity correction factors for site amplification obtained from earthquake analysis were extended to the entire city area. This procedure allowed us to provide a microzonation map of the urban area that can be directly used when calculating risk scenarios for civil defence purposes. The amplification factors estimated following this approach show values increasing along the main valley toward east where the detrital and alluvial complexes reach their maximum thickness.

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Authors and Affiliations

  1. Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Telegrafenberg, 14473, Potsdam, Germany

    Angelo Strollo, Stefano Parolai, Dino Bindi & Jochen Zschau

  2. University of Potsdam, Karl-Liebknecht-Strasse 24, Haus 27, 14476, Potsdam, Germany

    Angelo Strollo

  3. Istituto Nazionale di Geofisica e Vulcanologia, Via Bassini 15, 20133, Milano, Italy

    Dino Bindi

  4. DiSGG University of Basilicata, Viale dell’Ateneo Lucano, 85100, Potenza, Italy

    Leonardo Chiauzzi, Rossella Pagliuca & Marco Mucciarelli

Authors
  1. Angelo Strollo
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  2. Stefano Parolai
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  3. Dino Bindi
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  4. Leonardo Chiauzzi
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  5. Rossella Pagliuca
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  6. Marco Mucciarelli
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  7. Jochen Zschau
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Correspondence to Angelo Strollo.

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Strollo, A., Parolai, S., Bindi, D. et al. Microzonation of Potenza (Southern Italy) in terms of spectral intensity ratio using joint analysis of earthquakes and ambient noise. Bull Earthquake Eng 10, 493–516 (2012). https://doi.org/10.1007/s10518-011-9256-4

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  • DOI: https://doi.org/10.1007/s10518-011-9256-4

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