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from the hot crater lake since 1981 and 1983 respectively. The results are discussed as a function of the eruptive
evolution of the volcano over a 13 years period (1981-1994). It is shown that no definitely clear precursory radon
signals have been recorded. On the contrary, ionic species concentrations are likely to be considered good precursors,
together with the temperature variations of the crater lake water.
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