pyroclastic surge

Noun

(volcanology) A fluidized mass of turbulent gas and rock fragments which is ejected during some volcanic eruptions.

Japanese Meaning

火砕サージ：火山噴火時に放出される、乱流化したガスと岩石破片が混合した流動体。 / 火山の噴火現象で、流体化したガスと岩石の破片が急激に移動する現象。

The coastal town was overwhelmed within minutes when a pyroclastic surge swept down the volcano's flank.

海沿いの町は、衝撃性火砕流が火山の斜面を駆け下りてわずか数分で壊滅した。

Sense（1）

(volcanology) A fluidized mass of turbulent gas and rock fragments which is ejected during some volcanic eruptions.

pyroclastic surges

（ plural ）