活かっ火か山ざん

noun

active volcano

A volcano that has erupted in the recent past and is expected to erupt again. In Japan, the definition is based on eruptions within the last 10,000 years or ongoing fumarolic activity.

• 日本にほんには多おおくの活かっ火か山ざんがある。

  There are many active volcanoes in Japan.

• 活かっ火か山ざんの周しゅう辺へんでは、常つねに監かん視しが行おこなわれている。

  Monitoring is constantly carried out around active volcanoes.