2024 Volume 10 Issue 37 Pages 1413-1418
Ischia is an active volcanic island historically hit by several earthquakes, the last of which occurred on August 21st, 2017. After this event, seismic microzonation studies for three municipalities of the island were carried out, addressed to map the amplification of ground motion. These studies completely neglected the phenomena of ground instability and permanent deformation related to liquefaction and landslides, although these latter have been frequently triggered in the same area by both hydro-meteoric and seismic events, and pre-disposed by the volcanic origin of soil deposits. For the above reasons, a research project was addressed to fill these gaps, with the endorsement of the National Civil Protection and local authorities. This paper will show the main outcomes of the multi-level interdisciplinary approach adopted for liquefaction assessment. The results of simplified analyses showed a low susceptibility to soil liquefaction, while the advanced coupled analyses predicted significant pore water pressure accumulation along some soil profiles. The procedure adopted may constitute a valid methodological proposal for evaluating liquefaction susceptibility and for a preliminary estimate of its impact on the building heritage, through the determination of suitable damage parameters related to post-seismic settlement.
