Gargiulo, Francesco (2023) Multi-level analysis of seismic ground instability in the volcanic island of Ischia (Italy). [Tesi di dottorato]

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Abstract

After the recent seismic event of 21 August 2017 in Ischia Island, Seismic Microzonation (MS) studies for the municipalities of Casamicciola Terme, Lacco Ameno and Forio were carried out, addressed to map the amplification of ground motion, which is of interest for structural design and assessment. However, these studies completely neglected the phenomena of ground instability and permanent deformation related to liquefaction and landslides, being these latter historically frequent in the same area, for both hydro-meteoric and seismic events. These municipalities are characterised by the predominance of volcanic granular deposits, with a high degree of heterogeneity and poorly investigated under the geotechnical viewpoint. All these motivations encouraged the development of this work, endorsed by the Committee for the emergency management after the 2017 Ischia earthquake and self-financed by the University of Naples Federico II (F.R.A. project - MASLIDE). Liquefaction and slope stability analyses in seismic conditions have been conducted through a multi-level approach, i.e. at increasing levels of complexity. An important part of the work was devoted to the collection of available as well as new investigations in the study area. Great importance was also given to the definition of seismic action, defined on the basis of specific simulations of the source slip and deep propagation mechanisms.

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