pyroclast

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Related to pyroclastic: Pyroclastic rocks

pyroclast

[′pī·rə‚klast]
(geology)
An individual pyroclastic fragment or clast.
References in periodicals archive ?
A pyroclastic flow is a mix of hot ash, lava fragments and gases
Mount Shindake erupted last summer and the area where that pyroclastic flow occurred has been off limits since then, with the peak under a warning level of 3 on the Japanese scale of 1 to 5.
Villagers and a journalist prepare to flee as Mount Sinabung releases pyroclastic flows during its latest deadly eruption
On Saturday, a series of huge blasts and eruptions thundered from the 2,600m (8,530ft)-high volcano, sending lava and pyroclastic flows up to 4.
He said: "It's all about the build-up of pressure, the effects of temperature and explaining all the 'bits and pieces' like lava, magma, the pyroclastic flow - in simple terms this is a story about squeezing a spot but on a massive geographical scale.
Irrespective of its antiquity or of the drama of the eruption and ensuing pyroclastic surge, the exhibition presents, therefore, a picture both fascinating and terrifying of so many aspects of everyday life, public and intimate, seized in a moment of rapture and now revealed to public view and general judgement--a sort of ultimate Big Brother experience.
These catastrophic events have resulted in eruption columns of over 25km high and expelled widespread pyroclastic material over 130km.
Then avalanches of hot ash, pumice and gas known as pyroclastic flows poured out of the crater.
1902: Mount Pelee erupted on the island of Martinique: a pyroclastic flow travelling at several hundred miles an hour destroyed the town of St Pierre and killed more than 30,000 people in just three minutes.
The present study reports the laboratory simulation of the hydrothermal alteration of Neogene sedimentary and pyroclastic rocks exposed around the Sochagota Lake (Paipa, Boyaca) to zeolites to understand the geological conditions controlling their formation.
And based on what we have seen since yesterday afternoon, there are pyroclastic flows and we have no way of knowing which channel the next pyroclastic flow will follow.