Parametric numerical study of observed amplification effects on the colle di roio limestone ridge (Central italy)

Salomon Hailemikael, Luca Lenti, Salvatore Martino, Antonella Paciello, Gabriele Scarascia Mugnozza

Research output: Chapter in Book/Report/Conference proceedingChapter (peer-reviewed)

1 Citation (Scopus)

Abstract

Following the seismic microzonation studies of the L’Aquila area, Central Italy, hit by the Mw 6.3 L’Aquila earthquake of 6th April 2009, we observed ground motion amplification at the hilltop of the Colle di Roio limestone ridge. In particular, horizontal-to-vertical spectral ratio amplitude of weak motion waveforms showed average peak level above 5 in the frequency range 4-5 Hz. In order to evaluate the contribution of topography and subsoil heterogeneity on the observed response, we performed 2D numerical simulations of wave propagation through the ridge using a finite difference approach. Different hypothesis of model configuration, consistent with the available geological data, were tested. A homogeneous model was considered to evaluate the effect of surface topography on ground motion amplification, while several heterogeneous models were considered in order to examine the interaction between topography and heterogeneity on the seismic response. Results were analyzed in terms of synthetic horizontal-to-vertical (H/V) spectral ratios and the latter were compared to the observed ones. The results showed that the observed ground motion amplification level cannot be explained only by surface topography effect and that the assumption of an heterogeneous model with complex inner geometry may fairly reproduce the observations.
Original languageEnglish
Title of host publicationEngineering Geology for Society and Territory - Volume 5: Urban Geology, Sustainable Planning and Landscape Exploitation
PublisherSpringer International Publishing
ISBN (Electronic)9783319090481
ISBN (Print)9783319090474
DOIs
Publication statusPublished - 1 Jan 2015
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)
  • Social Sciences(all)

Cite this

Hailemikael, S., Lenti, L., Martino, S., Paciello, A., & Mugnozza, G. S. (2015). Parametric numerical study of observed amplification effects on the colle di roio limestone ridge (Central italy). In Engineering Geology for Society and Territory - Volume 5: Urban Geology, Sustainable Planning and Landscape Exploitation Springer International Publishing. https://doi.org/10.1007/978-3-319-09048-1_216