SEISMIC RESPONSE OF THE GEOLOGICALLY COMPLEX ALLUVIAL VALLEY AT THE "EUROPARCO BUSINESS PARK"(ROME - ITALY) THROUGH INSTRUMENTAL RECORDS AND NUMERICAL MODELLING — IJEGE
 
 
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SEISMIC RESPONSE OF THE GEOLOGICALLY COMPLEX ALLUVIAL VALLEY AT THE "EUROPARCO BUSINESS PARK"(ROME - ITALY) THROUGH INSTRUMENTAL RECORDS AND NUMERICAL MODELLING



Abstract:
The analysis of the local seismic response in the “Europarco Business Park”, a recently urbanized district of Rome (Italy) developed over the alluvial valley of the “Fosso di Vallerano” stream, is here presented. A high-resolution geological model, reconstructed over 250 borehole log-stratigraphies, shows a complex and heterogeneous setting of both the local Plio-Pleistocene substratum and the Holocene alluvia. The local seismo-stratigraphy is derived by a calibration process performed through 1D numerical modelling, accounting for: i) 55 noise measurements, ii) 10 weak motion records obtained through a temporary velocimetric array during the August 2009 L’Aquila-Gran Sasso seismic sequence and iii) one cross-hole test available from technical report. Based on the reconstructed seismo-stratigraphy, the local seismic bedrock is placed at the top of a gravel layer that is part of the Pleistocene deposits and it does not correspond to the local geological bedrock represented by Plio-Pleistocene marine deposits. 1D amplification functions were derived via numerical modelling along three representative sections that show how in the Fosso di Vallerano area two valleys converge into a single one moving from SE toward NW. The obtained results reveal a main resonance at low frequency (about 0.8 Hz) and several higher resonance modes, related to the local geological setting. Nonlinear effects are also modelled by using strong motion inputs from the official regional dataset and pointed out a general down-shift (up to 0.5 Hz) of the principal modes of resonance as well as an amplitude reduction of the amplification function at frequencies higher than 7 Hz.

Authors:
Francesca Bozzano - Sapienza Università di Roma - Dipartimento di Scienze della Terra - Piazzale Aldo Moro, 5 - 00185 Roma, Italy
Luca Lenti - University Paris-Est LCPC/The French institute of science and technology for transport, development and networks (IFSTTAR)/Department GERS - Champs sur Marne, France
Fabrizio Marra - Istituto Nazionale di Geofisica e Vulcanologia (INGV) - Via di Vigna Murata, 605 - 00143 Rome, Italy
Salvatore Martino - Sapienza Università di Roma - Dipartimento di Scienze della Terra - Piazzale Aldo Moro, 5 - 00185 Roma, Italy
Antonella Paciello - Agenzia Nazionale per le Nuove Tecnologie, l’Energia e lo Sviluppo Economico Sostenibile (ENEA – C.R. Casaccia) - Via Anguillarese, 301 - 00123 Rome, Italy
Gabriele Scarascia Mugnozza - Sapienza Università di Roma - Dipartimento di Scienze della Terra - Piazzale Aldo Moro, 5 - 00185 Roma, Italy
Chiara Varone - Sapienza Università di Roma - Dipartimento di Scienze della Terra - Piazzale Aldo Moro, 5 - 00185 Roma, Italy
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