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Macroseismic effects highlight site response in Rome and its geological signature |
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| Authors: | Paola Sbarra Valerio De Rubeis Emiliano Di Luzio Marco Mancini Massimiliano Moscatelli Francesco Stigliano Patrizia Tosi Roberto Vallone |
| Institution: | 1. Istituto Nazionale di Geofisica e Vulcanologia, Roma, Via di Vigna Murata, 605, 00143, Rome, Italy 2. Istituto per le Tecnologie Applicate ai Beni Culturali (ITABC), Consiglio Nazionale delle Ricerche Area della Ricerca Roma RM1??Montelibretti, Via Salaria km 29.300, CP 10, 00015, Monterotondo Stazione, Rome, Italy 3. Istituto di Geologia Ambientale e Geoingegneria (IGAG), Consiglio Nazionale delle Ricerche Area della Ricerca di Roma RM 1??Montelibretti, Via Salaria km 29.300, CP 10, 00015, Monterotondo Stazione, Rome, Italy |
| Abstract: | A detailed analysis of the earthquake effects on the urban area of Rome has been conducted for the L??Aquila sequence, which occurred in April 2009, by using an online macroseismic questionnaire. Intensity residuals calculated using the mainshock and four aftershocks are analyzed in light of a very accurate and original geological reconstruction of the subsoil of Rome based on a large amount of wells. The aim of this work is to highlight ground motion amplification areas and to find a correlation with the geological settings at a subregional scale, putting in evidence the extreme complexity of the phenomenon and the difficulty of making a simplified model. Correlations between amplification areas and both near-surface and deep geology were found. Moreover, the detailed scale of investigation has permitted us to find a correlation between seismic amplification in recent alluvial settings and subsiding zones, and between heard seismic sound and Tiber alluvial sediments. |
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