Conclusion (2):
Strombolian eruption: a series of explosions
Alternance between gas
pockets and no activity:
is similar to Hawaii but
corresponds to a larger
magma viscosity
Bubble bursting
at Etna, July 2001
Eruption dynamics is driven by gas
Need for measurements of gas
volume
such as radar and
acoustic measurements, …
Etna: cyclic fire fountains + gas
composition gives unambiguous
evidence for being driven by gas
accumulation at depth