New geophysical insight into the dynamics of Stromboli volcano (Italy)

摘要: Abstract A 56-hour gravity sequence, recorded in the crater area of Stromboli volcano, is presented. Data were acquired during a period “normal” Strombolian activity. High-frequency anomalies (up to 20 μGal; T = tens seconds) are observed. Comparison with independent data reveals that these changes reflect response gravimeter excited by seismic waves explosions. Correlated energy distribution over time appear continuous wavelet transforms and RMS-tremor, but different scales, corresponding periods centered at about 50 25 min, for tremor, respectively. We infer rate fresh magma supply shallow feeding system controls coupled components RMS-tremor signals. In particular, signal (with an average amplitude 1–2 μGal) could be induced temporary accumulations, depth, volatiles discharged quiescent degassing. Changes explosions from summit craters correlate volcanic tremor oscillations, implying that, even though slug-genesis process behind occurs deeper levels, it also controlled gas-rich below. Negative 20 μGal, intervals some hours, observed, separated 24 h. They increases vesicularity uppermost part conduit plexus, view supported (i) time/space amplitudes (ii) spattering activity vent, both occurring development negative anomalies. The processes mild do not trigger measurable changes. Nevertheless, slug ascent before major explosion induce precursory signal.