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The map offers an overview of the volcano-tectonic evolution of the island and updates knowledge on underground water circulation, in order to have increasingly refined data for the correct management of resources and natural risks

La first map of the hydrogeological complexes of the island of Ischia was carried out through a multidisciplinary study recently published in the international scientific journal Journal of Maps.
The map, made at 1:10.000 scale, was published in the studio “Geohydrologic units of Ischia Island (Southern Tyrrhenian Sea, Italy)”, and is the result of the collaboration of a multidisciplinary team of researchers from the Vesuvian Observatory ofNational Institute of Geophysics and Volcanology (INGV-OV) and the Department of Earth, Environmental and Resource Sciences (UniNA - DiSTAR) ofUniversity of Naples Federico II.
The work was based on the most recent geological and volcanological cartography of the island of Ischia, on new volcanological and hydrogeological field surveys, on the INGV database and on a detailed survey of the natural and thermo-mineral springs, which allowed us to mend the gap between the historical-documentary sources and the cartography that has existed so far.
“The geochemical characterization of the fluids and groundwater that circulate in volcanic systems has always aroused particular interest in the scientific community”, explains Silvia Fabbrocino, DiSTAR researcher, associated with INGV and co-coordinator of the study group. “The chemical and mechanical processes associated with the migration and evolution of magma bodies can in fact have repercussions on hydrothermal systems. The evaluation of the conditions that regulate underground water circulation in active volcanic areas is, therefore, a useful tool not only for the management of the huge water resource, but also for the evaluation of volcanic danger".
The volcanic system of the island of Ischia is characterized by intense hydrothermal activity, documented since the beginning of the 16th century. The island's fame, in fact, is largely linked to the seventeenth-century study by Giulio Iasolino which represents the first systematic analysis of the island's thermal springs for therapeutic purposes. Since then, multiple studies have followed which have contributed to the refinement of knowledge on the volcanic, hydrogeological and hydrothermal characteristics of the island, highlighting the strong interaction between the hydrothermal circuits and volcano-tectonic processes.
“Until now, the scientific community lacked a fundamental and basic tool such as the Map of hydrogeological complexes at a detailed scale that we have just published”, goes on Sandro de Vita, researcher at INGV and co-coordinator of the research group.
“Thanks to the presentation of the recognized hydrogeological series and the identification - in some cases the rediscovery - of the numerous thermo-mineral springs and fumaroles present in the area, our work represents a synthesis of the volcano-tectonic history of Ischia and the related flow conditions underground water, essential for the optimal design of a hydrogeological, geochemical and volcanic monitoring network on the island"he concludes Mauro Antonio DiVito, Director of the INGV Vesuvian Observatory (INGV-OV) and co-coordinator of the research group.

Link to the article: Geohydrologic units of Ischia Island (Southern Tyrrhenian Sea, Italy)

Useful links:
National Institute of Geophysics and Volcanology (INGV)
Vesuvian Observatory (INGV-OV)
University of Naples Federico II (UNINA)
Department of Earth, Environmental and Resource Sciences (DiSTAR) of the Federico II University
Hydrogeological map of Ischia