Two-stage modeling of Strombolian-type eruptions and quantification of the model parameters: Insight from the seismic and acoustic signals

Publication date: December 2019Source: Physics of the Earth and Planetary Interiors, Volume 297Author(s): Vyacheslav M. Zobin, Jean Battaglia, William Melson, Yasuaki SudoAbstractThe seismic signals of majority Strombolian explosions show a two-phase structure that may be the result of a two-stage explosive eruption. We quantify the parameters of two proposed stages of Strombolian eruptions at volcanoes Arenal, Aso and Yasur using 193 seismic records and 18 acoustic signals and considering that the first stage of eruption represents the seismically active process of the gas slug expansion and ascent (GSEA) in the conduit and the second stage is associated with the gas slug burst at the surface. It is shown that the radiated seismic energy of Strombolian explosions at volcanoes is strongly dependent on the seismic energy radiated during GSEA. The seismic energy of explosions is correlated also with the duration of GSEA process in the interval of durations between 1.3 and 3.7 s. For shorter GSEA durations, the correlation is absent. The acoustic energy of explosions is characterized by inverse dependence on the durations of GSEA. These results demonstrate the influence of the GSEA process on the surface manifestations of Strombolian explosions.

Source: Physics of the Earth and Planetary Interiors - October 29, 2019 Category: Physics Source Type: research