volcanic hazards on a dominantly effusive, frequently active volcano like Piton de la
Fournaise. Only three summit collapse events (1986, 2002, 2007) have been recorded since
the foundation of the Piton de la Fournaise volcano observatory (OVPF) in 1979, and two of
them (1986 and 2007) were associated with weak phreatic activity. At Piton de la Fournaise,
the normal explosive activity consists of short-lived and mild (< 20 m-high) lava fountains …
Summit explosive activity and collapses represent major volcanic hazards on a dominantly
effusive and frequently active volcano like Piton de la Fournaise. Only three summit collapse
events (1986, 2002 and 2007) have been recorded since the foundation of the Piton de la
Fournaise volcano observatory (OVPF) in 1979 and two of them (1986 and 2007) were
associated with weak phreatic activity. Except during these three events, most eruptions
consist in short short-lived (< 3 hours) and mild (< 20 m-high) lava fountains quickly evolving …