source: [僕は友達が少ないの志熊理科のバックで火山が噴火するGIF画像｜無料GIF画像検索 GIFMAGAZINE 671225]

(of a volcano) become active and eject lava, ash, and gases:

〈火山が〉噴火する; 〈溶岩などが〉噴出する

e.g. Mount Pinatubo began erupting in June.

be ejected from an active volcano:

〈火山が〉〈溶岩など〉を噴出する

e.g. hot lava erupted from the crust.

(of an object) explode with fire and noise resembling an active volcano:

e.g. smoke bombs erupted everywhere.

break out or burst forth suddenly and dramatically:

｟報道｠ 〈暴動･けんかが〉突然起こる, 始まる, 勃発する(break out).

e.g. fierce fighting erupted between the army and guerrillas

e.g. cheers erupted from the crowd.

give vent to anger, enthusiasm, amusement, or other feelings in a sudden and noisy way:

〖～ in/into A〗 〈人･地域が〉突然A〈状態〉になる

e.g. the soldiers erupted in fits of laughter.

(of a pimple, rash, or other prominent mark) suddenly appear on the skin.

〘医〙 〈湿疹（しっしん）などが〉(突然)発疹（ほっしん）する; 〖～ in/into A〗 〈皮膚が〉A〈湿疹など〉を(突然)吹き出す

(of the skin) suddenly develop a pimple, rash, or mark.

(of a tooth) break through the gums during normal development.

〈歯が〉生え始める

mid 17th century: from Latin erupt- ‘broken out’, from the verb erumpere, from e- (variant of ex-) ‘out’ + rumpere ‘burst out, break’.