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Spigo, U.
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- PublicationRestrictedInvestigation of Archaeological Evidence for a Possible 6th-7th Century AD Earthquake in Capo d'Orlando (NE Sicily)(2008-03)
; ; ; ; ; ; ;Bottari, C.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Bottari, A.; Osservatorio Sismologico, University of Messina, Messina, Italy. ;Carveni, P.; Dipartimento di Scienze Geologiche, University of Catania, Catania, Italy. ;Mastelloni, M.; Archaeological Museum of Messina, Messina, Italy. ;Ollà, M.; Archaeological Superintendence of Messina,Messina, Italy. ;Spigo, U.; Archaeological Superintendence of Catania,Catania, Italy; ; ; ; ; The archaeological site of Capo d’Orlando, located in NE Sicily was intensively inhabited during the Roman and Byzantine periods (3rd to the 7th century AD) during which a bath complex probably associated to a large villa extending seawards was built. Archaeoseismological research shows that during the Byzantine period (6th -7th century AD) this complex suffered damage: (1) collapse of the bath, (2) tilting of parallel dry masonry walls in the same direction, and (3) cracking of the floor in the bath. This damage might have been produced by a seismic event, where the level of destruction indicates a strong shaking. The historic record of earthquakes prior to the year 1000 AD is probably not complete. Actually, only four earthquakes are vaguely reported in the seismic literature for this time span. This lack of historical reports on seismic events does not necessarily mean that any earthquakes happened. Archaeoseismic data show that the island was not quiescent but on the contrary suffered several earthquakes. The analysis presented here, based on detailed site surveys, deals principally with seismic causes but it also takes into account other possible causes with regard to the observed damage.293 37 - 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