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Saccà, C.
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- PublicationRestrictedAnalysis of Earthquake Damage to Ancient Buildings on the San Raineri Peninsula, Messina, Sicily(2010-10)
; ; ; ; ; ;Bottari, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Carveni, P.; Dipartimento di Scienze Geologiche, Università di Catania, Catania, Italy ;Saccà, C.; Osservatorio Sismologico DIC, Università di Messina, Messina, Italy ;Copat, B.; Freelance Geologist, Messina, Italy ;Iaria, G.; Oloturia Sub, Messina, Italy; ; ; ; A study aimed to shed some light on building collapse caused by the strongest earthquakes in the San Raineri Peninsula (Messina) is here reported. Although a compilation of structurally damaged buildings is widely reported in historical sources, the interpretation of seismic collapse has often been doubtful or ambiguous. We therefore performed an exhaustive and detailed review of seismic effects caused by the 1783 and 1908 earthquakes on the peninsula buildings. Geological and geotechnical data were also collected on the peninsula. The results of boring data reveal high seismic vulnerability for the peninsula in some areas. The study shows that the ancient buildings were damaged by settlement due to soil liquefaction rather than by seismic shaking of the large walls. The obtained results show that further investigations must be carried out in this area for a correct town planning of the peninsula.493 48 - PublicationRestrictedEvidence of seismic deformation of the paved floor of the decumanus at Tindari (NE, Sicily)(2008)
; ; ; ; ; ; ;Bottari, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Bottari, A.; Osservatorio Sismologico, University of Messina, Italy ;Carveni, P.; Dipartimento di Scienze Geologiche, University of Catania, Italy ;Saccà, C.; Osservatorio Sismologico, University of Messina, Italy ;Spigo, U.; Archaeological Superintendence of Catania, Italy ;Teramo, A.; Osservatorio Sismologico, University of Messina, Italy; ; ; ; ; Most of the ancient town of Tindari (NE, Sicily) was settled on a plateau the most surficial layer of which was made of unconsolidated material. Ongoing excavations at the archaeological site at Tindari uncovered a large portion of the decumanus which suffered deformations preliminarily assigned to coseismic effects. An analysis of the local dynamic response through the simulation of strong seismic shaking to the bedrock and modelling of spectral ratios of the bedrock-soft soil was carried out to verify the susceptibility of superficial terrains of the promontory to coseismic deformations. To perform this simulation the finite element method (FEM) was used. Four accelerometric recordings of three earthquakes of medium-high magnitude, recorded on rocky sites, were chosen to simulate the seismic shaking, using a constitutive law for the materials composing the promontory layers both of linear-elastic type and of elastoplastic type. The analysis of the linear-elastic field allowed the definition of the frequencies for which the spectral ratios of the accelerations recorded the highest amplifications; in particular the frequency range 31.5–37.2 Hz can be combined with deformation of the paved floor of the decumanus. The analysis in the elastoplastic field highlighted the zones of promontory more susceptible to suffer plasticization process. The results show that the topmost layer of the decumanus is the most susceptible to suffer plasticization. Therefore, the performed analysis lends greater support to the hypothesis that the deformations were produced by seismic shaking.257 32