Pyroclastic flow9/12/2023 ![]() This leaves the authorities in an impossible situation. It is rare that eruptions from Fuego produce such large pyroclastic flows that travel so far. This suggests that further education of people living in and around Fuego of its volcanic hazards would not only be helpful, it would save lives. It is certainly a hypnotic and beautiful phenomenon to observe, but any volcanic cloud moving even vaguely in your direction is a clear sign to flee. What surprised many volcanologists (including us) is that people were actually standing and taking pictures while watching this billowing cloud descend. Small-medium pyroclastic flows at Mayon Volcano. These spectators escaped death by seconds, as this benign-looking ash cloud is the notorious killer that is a pyroclastic flow. ![]() Footage shows the ash cloud quickly pass under and then over the bridge. Unease spreads and soon alarms sound before people rush away just in time. Spectators and officials watch mesmerised, but then the cloud moves into the valley and heads directly towards the bridge. So, just what are these flows and why are they such killers? And what can people do to avoid them?įootage taken from a road bridge over a dry valley from on June 3 at Fuego shows what appears to be a soft and billowing ash cloud gently flowing down the volcano. Of these two, pyroclastic flows are the big killers, and are responsible for the deaths from the latest eruption. These larger eruptions have two main primary hazards – falling ash and bombs (collectively known as tephra), and pyroclastic flows. But Fuego also has a reputation for producing larger explosive eruptions. In recent years, Fuego has regularly ejected small gas and ash eruptions, which hold little risk to surrounding populations.
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