Blast waves from violent explosive activity at Yasur Volcano, Vanuatu

Dario Delle Donne, Garaebiti, Genco, Delle Donne, Finizola, Ripepe, Marchetti

Risultato della ricerca: Articlepeer review

54 Citazioni (Scopus)


Infrasonic and seismic waveforms were collected during violent strombolian activity at Yasur Volcano (Vanuatu). Averaging similar to 3000 seismic events showed stable waveforms, evidencing a low-frequency (0.1-0.3Hz) signal preceding similar to 5-6s the explosion. Infrasonic waveforms were mostly asymmetric with a sharp compressive (5-106Pa) onset, followed by a small long-lasting rarefaction phase. Regardless of the pressure amplitude, the ratio between the positive and negative phases was constant. These waveform characteristics closely resembled blast waves. Infrared imagery showed an apparent cold spherical front similar to 20 m thick, which moved between 342 and 405m/s before the explosive hot gas/fragments cloud. We interpret this cold front as that produced by the vapor condensation induced by the passage of the shock front. We suggest that violent strombolian activity at Yasur was driven by supersonic dynamics with gas expanding at 1.1 Mach number inside the conduit.
Lingua originaleEnglish
pagine (da-a)5838-5843
Numero di pagine6
RivistaGeophysical Research Letters
Stato di pubblicazionePublished - 2013

All Science Journal Classification (ASJC) codes

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