GNGTS 2017 - 36° Convegno Nazionale

GNGTS 2017 S essione 2.1 319 Geophysical related monitorings at GEA Observatory A. Brucolini 1 , C. Fidani 1,2,3 , N. Fortini 1 , L. Sdei 1 , A. Bertucci 1 , D. Santoni 1 1 GEA Observatory, Foligno, Italy 2 Central Italy Electromagnetic Network, Fermo, Italy 3 SARA Electronic instruments, Perugia, Italy The GEA Observatory is a non profit organization that instrumentally studies geophysical parameters and educates populations in the Umbria Region on a correct behaviour with respect to these parameters. This organization was founded after the 30 October 2016 Norcia (Perugia) earthquake, and rapidly developed into an instrumental network. Moreover, GEA monitors the and mitigates other geophysical events such as those occurring in the Valnerina area in 1979 and Colfiorito in 1997. Additionally, GEA was designed to carry out not only seismic observations but also geophysical observations in the region of Umbria: from water levels and temperatures to ground Radon releases as well as from atmospheric variables to meteorological forecasts. GEA was founded on the experience of the Folignometeo Meteorological Associations, which converged with GEA. Following the strong earthquakes in 2016 and at beginning of 2017 in Central Italy, several observations of water temperature increases were observed in wells of the Valle Umbra, nearby the city of Spoleto. The advent of both low cost thermometers and hygrometers with data logger, has allowed to realise a more effective and dense network of geophysical observatories. These observatories have been equipped with autonomous systems which also include: seismometers, Radon meters, meteorological stations, video cameras and electromagnetic detectors. The latter instruments are of the same type that is used the Central Italy Electromagnetic Network (Fidani, 2011; Fidani and Martinelli, 2015; Fidani and Marcelli, 2017). GEA has performed continuous measurements of well temperatures and Radon gas levels since March 2017; seismic activity started to be monitored from 2015 and meteorological variables have been monitored in Colfiorito, Scopoli, Pale and the airport of Foligno from the past century. Electromagnetic measurements started from 2008 in Perugia, from 2013 in Avigliano Umbro, from 2014 in Camerino, from 2015 in Colfiorito, from 2016 in Norcia and from 2017 in Narni. Education and resilience, regarding geophysical variables, are also carried out by GEA. Particular attention is paid to recording the behaviour of children before, during and after earthquakes and natural disasters, especially for the 1997 Colfiorito earthquake (Mosciatti, 1997). Geophysical data are stored in a digital database and at the moment have being kept for further analysis, which will investigate for an association with population health or an with other variables stored in regional databases. Fig. 1 shows the apparatus used to record water well temperature. It is composed of three 1.5 litre plastic bottles. A temperature sensor is fixed to the rimof one of the bottles and connected to the data logger by a wire. The data logger and thermo-hygrometer INKBIRD THC-4 LCD are able to record about two months of data, with collections every 5 minutes. Instrumental resolution of this instrument is 0.1°C and 0.1% hum, and its precision is 1°C and 2%. Given the high level of humidity inside the wells, a protection is fitted around the data logger with the second bottle. Awire is attached to the apparatus so that the apparatus can be easily extract from wells. This apparatus was inserted into five different wells having water depths level ranging between 5 and 25 m. The wells were chosen based upon past occasional observations of hot water. Data extracted from a temperature recording is shown in Fig. 1 - The apparatus with temperature and humidity sensors and data logger realised for several wells.