火か山ざん泥でい流りゅう

noun

volcanic mudflow; lahar

Technical term in volcanology for a destructive mudflow composed of volcanic debris and water, often triggered by heavy rain or crater lake outbursts.

• 火か山ざん泥でい流りゅうは、火か山ざん噴ふん火かに伴ともなって発はっ生せいすることがある。

  Volcanic mudflows can occur in association with volcanic eruptions.

• この地ち域いきでは過か去こに大だい規き模ぼな火か山ざん泥でい流りゅうが発はっ生せいし、多おおくの家か屋おくが流ながされた。

  A large-scale volcanic mudflow occurred in this area in the past, sweeping away many houses.