Image for Pyroclastic flows

Pyroclastic flows

Duration: 03:01

The 1980 eruption of Mount St Helens and El Chichon two years later were the first times that pyroclastic flows were studied using modern scientific methods, as volcanologist Haraldur Sigurdsson explains in this clip. These devastating flows of hot ash and rock speed down the slopes of volcanoes destroying everything in their path.

Available since: Mon 4 Apr 2011


Haydn Gwynne
Series Editor
John Lynch
Judith Bunting
Judith Bunting

This clip is from

Horizon 1997-1998, The Curse of Vesuvius

Geologists reassess evidence from Pompeii, famously destroyed by the volcano, Vesuvius.

First broadcast: 16 Apr 1998

Image for The Curse of Vesuvius Not currently available on BBC iPlayer

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