Recovery and processing of hydrological and hydrogeochemical parameters for researches on earthquake short-term precursors in Italy.

Hydrological and hydrogeochemical observations (piezometry, chemistry, electric properties, etc.) carried out in groundwaters in Italy in the past 40 years have been recovered and processed. Available data time series recorded by government agencies, scientific institutions and independent researchers in the field of groundwater and geochemical monitoring in 5480 different sites have been recovered, systematized and processed. Meteorological data useful for data evaluation have been recovered too. Some possible precursors have been identified but the relatively high amount of earthquakes not preceded by hydrologic or geochemical anomalies suggest the need to consider all together geophysical and geochemical parameters for future researches. Highest amount of data collected by manual sampling were found in the Lombardy, Veneto, and Emilia-Romagna regions, while most of automatically recorded data were found in the Tuscany region.