Seismic monitoring of active volcanoes is necessary for detecting changes in background volcano dynamics to put in evidence possible precursors of an imminent eruption. Unfortunately, there is no clear relationship between the energy of precursory signals and the strength of subsequent volcanic activity. For example, swarms of small and shallow volcano‐tectonic (VT) or long‐period (LP) quakes (for the usual current classification, see Chouet, 2003) or volcanic tremor episodes may be the only seismic precursor of important phreatic activity (see Barberi et al., 1992; Nakada and Shimizu, 1999). In case of high noise level, these signals may...

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