Abstract
Two helium surveys were carried out at Phlegraean Fields in July and September 1983 aiming at locating loci of discontinuities (fractures) in the area on the basis of variations in helium concentrations following the bradyseismic crisis then in progress.
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Lombardi, S., Di Filippo, M. & Zantedeschi, L. Helium in Phlegraean Fields soil gases: July 20th–26th — September 19th–25th, 1983. Bull Volcanol 47, 259–265 (1984). https://doi.org/10.1007/BF01961556
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DOI: https://doi.org/10.1007/BF01961556