Pyroclastic in a sentence

Temperatures as high as 1,200 °C are known to occur in pyroclastic flows, which will incinerate everything flammable in their path and thick layers of hot pyroclastic flow deposits can be laid down, often up to many meters thick.

While the eruption lasted for around 24 hours, the first pyroclastic surges began at midnight, causing the volcano's column to collapse.

If larger explosions do occur their style and magnitude cannot be predicted; it is possible that they could produce more ballistics and ash, and possibly also pyroclastic surges (defined below).

Increased vigilance against pyroclastic density currents, lahars and sediment-laden stream flows along channels draining the edifice was also advised.

An exclusion zone that extends from the south coast of the island north to parts of the Belham Valley was imposed because of the size of the existing volcanic dome and the resulting potential for pyroclastic activity.

Another study used the magnetic characteristics of over 200 samples of roof-tile and plaster fragments collected around Pompeii to estimate equilibrium temperature of the pyroclastic flow.

A total of 57 people are known to have died, and more were left homeless when the ash falls and pyroclastic flows destroyed or buried 200 houses.

Basaltic tuff or pyroclastic rocks are rare but not unknown.

Clay, fine sand and silt, and fine-grained, pyroclastic material are all susceptible to earthflows.

In the most recent period of increased activity at the Soufrière Hills volcano, from November 2009 through February 2010, ash vented and there was a vulcanian explosion that sent pyroclastic flows down several sides of the mountain.

In this scenario the slopes of the mountain, extending out to about convert from the vent, may be exposed to pyroclastic flows sweeping down them, whilst much of the surrounding area could suffer from tephra falls.

Large pyroclastic flows and mudflows subsequently rushed down St. Helens' west flanks and into the Kalama River drainage system.

Moments before his position was hit by the pyroclastic flow, Johnston radioed his famous last words: "Vancouver!

The magma in St. Helens burst forth into a large-scale pyroclastic flow that flattened vegetation and buildings over convert.

The plan assumes between two weeks and 20 days' notice of an eruption and foresees the emergency evacuation of 600,000 people, almost entirely comprising all those living in the zona rossa ("red zone"), i.e. at greatest risk from pyroclastic flows.

This pyroclastic surge could not be restrained by the ghaut and spilled out of it, killing 19 people who were in the (officially evacuated) Streatham village area.