1. pyroclastic - Noun
2. pyroclastic - Adjective
pyroclastic (not comparable)
(volcanology) Mostly composed of rock fragments of volcanic origin or comminuted during an eruption.
pyroclastic (plural pyroclastics)
A rock mostly composed of rock fragments of volcanic origin
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. Source: Internet
Clay, fine sand and silt, and fine-grained, pyroclastic material are all susceptible to earthflows. Source: Internet
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. Source: Internet
Large pyroclastic flows and mudflows subsequently rushed down St. Helens' west flanks and into the Kalama River drainage system. Source: Internet
Basaltic tuff or pyroclastic rocks are rare but not unknown. Source: Internet
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. Source: Internet