Changes in geochemical and isotopic contents in groundwater before seismic events in Ischia Island (Italy).

We analysed the hydrogeochemical and isotopic contents in groundwater for the period 2002-2020, in the Ischia Island, a volcanic island in Southern Italy, and compared them with seismic events that occurred in the same period. The study is based on a large hydrochemical database, which includes chemical (major and minor compounds, metals and trace elements) and isotopic analyses (δO and δH). For each of the 34 seismic events occurred in the studied period, we considered coordinates, date, time, depth and magnitude.

Nitrate trends in groundwater of the Campania region (southern Italy).

The Environmental Protection Agency of the Campania region in Italy (ARPAC) manages a groundwater quality monitoring network. For almost all the polluted waters, the key parameter driving the classification is the concentration of nitrate; hence, the Campania region, in coherence with the EU regulations, outlined the vulnerable areas and undertook remediation policies. The best groundwater quality is recorded for carbonate aquifers of the Apennine chain; on the contrary, the Tyrrhenian coastal plains are affected by severe contamination, with a locally very contaminated groundwater of the shallow and also the deeper aquifers.