First developped on Strombolian
explosions:
permanent activity and not
dangerous (close to the vent)
A series of bubbles bursting at
the top of the magma column
duration: a few seconds
Intermittency: minutes to hours
Etna,
July 2001
(Pfeiffer)
Ejecta velocity = 50 m/s Gas velocity = 100 m/s
Ejecta size = 2 cm (Stromboli) = 20 cm (Etna)
Buble diameter = several meters (Heimaey, Etna, Erebus, Kilauea…)
Direct measurements (10): Acoustic records