1,721,006 research outputs found
No evidence of a new magmatic gas contribution to the Solfatara volcanic gases, during the Bradyseismic crisis at Campi Flegrei (Italy).
No full textA volcano‐tectonic crisis with strong seismic activity and rapid uplift started in 1982, and continued until its abrupt disappearance at the beginning of 1985, at Campi Flegrei caldera (Southern Italy). The chemical composition of the fumarolic fluids has been recorded during the last five years and, from geochemical and thermodynamical considerations, it has been deduced that the shallow reservoir feeding the fumaroles remained chemically isolated, at least with respect to major magmatic components, from the magma chamber inferred to be located at depth. © 1988 by the Chinese Geophysical Societ
10th of April 1987 seismic swarm: Correlation with geochemical parameters in Campi Flegrei Caldera (southern Italy)
No full textA close relationship between geophysical activity (seismicity and ground deformation) and chemical changes in volcanic reservoirs has been proposed several times in active volcanic areas. In Campi Flegrei caldera, especially during the bradyseismic crisis which occurred between 1982‐1984, this correlation was never clearly demonstrated because of the high rate of occurrence of earthquakes and the small number of gas samples. After at least two years of both geochemically and geophysically quiescent period, a swarm of 50 earthquakes, felt in the area of the Solfatara crater with 2.0 maximum magnitude, occurred on the 10th of April 1987. At about the same time (before and after), several geochemical parameters showed important changes in concentration. These include water vapour, nitrogen, hydrogen, methane and to a lesser extent hydrogen sulfide in fumarolic gases from Bocca Grande fumarole in the Solfatara crater and the radon content in water wells situated far from the swarm epicentral area. In our opinion, the processes causing the geochemical changes are linked to aseismic creeping mechanisms, which leads to an easier rising of fluids in fumaroles (H2O, N2, H2 and CH4) and in the superficial water table (Rn). The subsequent seismicity could be related to consequent local stress accumulation on gas reservoir rocks induced by creeping. Copyright 1988 by the American Geophysical Union
Geoelectrical and seismic prospections in hydrogeology: model and master curves for the evaluation of porosity and water saturation
No full textGeoelectrical and seismic prospections in hydrogeology: model and master curves for the evaluation of porosity and water saturation
No full textGeoelectrical and seismic prospections in hydrogeology: model and master curves for the evaluation of porosity and water saturation
No full textRadon variation in groundwaters in the Campi flegrei Caldera (Southern Italy) during and after the 1982-1984 brabyseismic crisis
No full textHe, C and S isotopes in subaerial and submarine fumaroles from the caldera of Phlaegrean Fields, Italy
No full textRadon variation in groundwaters in the Campi flegrei Caldera (Southern Italy) during and after the 1982-1984 brabyseismic crisis
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