EGU21-6078, updated on 04 Mar 2021
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Local Seismic site effects estimated by detailed seismic surveys: the case of Castelnuovo village (L’Aquila Basin, central Italy)

Marco Spadi1, Marco Tallini1, Matteo Albano2, Domenico Cosentino3, Marco Nocentini4, and Michele Saroli2,5
Marco Spadi et al.
  • 1Dipartimento di Ingegneria Civile, Edile-Architettura e Ambientale (DICEAA), Università degli Studi dell’Aquila, L'Aquila, Italy (
  • 2Istituto Nazionale di Geofisica e Vulcanologia (INGV), Roma, Italy
  • 3Dipartimento di Scienze, Università degli Studi Roma Tre, Roma, Italy
  • 4Istituto di Geologia Ambientale e Geoingegneria – CNR (IGAG), Roma, Italy
  • 5Dipartimento di Ingegneria Civile e Meccanica (DICeM), Università degli Studi di Cassino e del Lazio meridionale, Cassino, Italy

Assessing seismic site effects is essential in earthquake hazard studies. Local seismic amplification is strongly related to the site stratigraphy and topography, the dynamic properties of the subsoil deposits, and the earthquake features. The evaluation of these factors is mandatory to achieve a consistent model of the seismic hazard at small scale. Here we discuss the case of Castelnuovo village (L’Aquila, central Italy). Located on a small ridge, approximately 60 m higher than the valley floor, the village was heavily struck by April 6, 2009, Mw 6.3 L’Aquila earthquake, with catastrophic collapse of several buildings. Previous studies ascribed the observed damage to the presence of shallow caves beneath the buildings or to the topographic amplification.

In this work, an updated and detailed subsoil model for Castelnuovo site has been provided, based updated geological surveys, such as borehole logs and geophysical data consisting in microtremor measurements and down-hole.

These measurements identified resonant frequencies occurring in the range of 0.7-3.0 Hz. These frequency peaks are related to the presence of a velocity contrast at depth between the San Nicandro silts and the Madonna della Neve breccias, as indicated by the performed deep boreholes. Thanks to analytical, numerical, and geostatistical techniques, we identified the main impedance contrast at approximately 210 m depth from the top of the hill, much deeper than previous studies. These new findings allowed to create an accurate and consistent subsoil model summarized by two geological cross-sections of the Castelnuovo ridge, showing that the seismic site effects at the Castelnuovo village are mainly related to stratigraphic amplification.

How to cite: Spadi, M., Tallini, M., Albano, M., Cosentino, D., Nocentini, M., and Saroli, M.: Local Seismic site effects estimated by detailed seismic surveys: the case of Castelnuovo village (L’Aquila Basin, central Italy), EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-6078,, 2021.