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Discussion papers
https://doi.org/10.5194/se-2019-25
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-2019-25
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 15 Feb 2019

Research article | 15 Feb 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Solid Earth (SE).

Seismic Hazard of L'Aquila downtown (central Italy): new insights for 3D geological model based on high-resolution seismic reflection profile and borehole stratigraphy

Marco Tallini1, Marco Spadi1, Domenico Cosentino2, Marco Nocentini3, Luca Macerola1, Giuseppe Cavuoto4, and Vincenzo Di Fiore4 Marco Tallini et al.
  • 1Dipartimento di Ingegneria Civile, Edile-Architettura, Ambientale, Università degli Studi dell’Aquila, Via Giovanni Gronchi, 18, 67100 L’Aquila, Italy
  • 2Dipartimento di Scienze, Università degli Studi Roma Tre, Largo San Leonardo Murialdo, 1, 00146 Roma, Italy
  • 3Istituto di Geologia Ambientale e Geoingegneria-CNR, Via Salaria km 29.300, 00015 Montelibretti, Roma, Italy
  • 4Istituto per l'Ambiente Marino Costiero–Consiglio Nazionale delle Ricerche, Calata Porta di Massa, 80133 Napoli, Italy

Abstract. On 6 April 2009, a Mw 6.1 earthquake struck the Plio-Quaternary intermontane L'Aquila Basin in central Italy, causing strong damages in L'Aquila historical downtown and surroundings, which were affected by notable site effects. Previous works have suggested that different site effects may be related to the complex subsurface geologic architecture, given by the variability of thickness and lithology of L'Aquila Basin clastic deposits, on which the city was built. To improve the 3D geological model of L'Aquila downtown for seismic site response evaluation and to estimate the Seismic Hazard of possible buried active normal faults, a multitask project has been carried out consisting mainly of the integration of subsurface dataset, including geological and geophysical surveys. Data have been interpreted with the aim to conceive and build a detailed model for the Plio-Quaternary cover of the continental basin and the buried morphology of the Meso-Cenozoic bedrock. We report the results concerning the interpretation of a 1 km-long high-resolution seismic reflection profile and refraction tomography integrated with the stratigraphy from deep and shallow boreholes. The results allowed us to reconstruct the Plio-Quaternary succession below L'Aquila downtown. The Plio-Quaternary depocentre corresponds to a minor NNW-SSE graben, which is developed within the main regional graben that borders L'Aquila Basin. Finally, data interpretation allowed to reconstruct the Plio-Quaternary tectono-stratigraphic evolution of the basin, to evidence the recent activity of several faults, and to define the subsoil geological model of the study area. All these data, which are functional to define the seismic site effects and to detect the activity of faults, are useful to mitigate the Seismic Hazard of cultural heritage cities of central Italy, such as the case study of L'Aquila downtown.

Marco Tallini et al.
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Marco Tallini et al.
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Short summary
The interpretation of a 1 km-long high-resolution seismic reflection profile integrated with borehole stratigraphy was useful to reconstruct the geological subsoil model of L'Aquila downtown which was struck by the 6/4/2009 Mw 6.1 earthquake, and thus to provide indication on the seismic site effects and the faults activity. This information was essential to design urban masterplan able to mitigate the Seismic Hazard of cultural heritage cities of central Italy, such as the case study site.
The interpretation of a 1 km-long high-resolution seismic reflection profile integrated with...
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