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活火山

层状火山構造的橫切圖
1.主岩漿庫
2.基岩
3.主熔岩通道
4.地面
5.侵入性火成岩脈
6.熔岩岔道
7.火山灰堆積層
8.側翼
9.熔岩堆積層
10.火山喉
11.寄山火山錐
12.熔岩流
13.噴發口
14.主火山口
15.灰雲

活火山火山的一個種類,指現時仍然活躍的火山,以有別於休火山死火山

然而,火山學的學者並沒有一個共同明確的標準來判定一個火山是否是活火山,尤其火山活動的週期可能長達数百萬年,人類紀錄中的火山活動對於火山種類的判斷意義可能不大。

一般判定活火山,是以現在火山活動的情形來判斷,除了噴發之外,其他的活動的情形如造成地震、噴發氣體等,都可能作為活火山的判準。例如大屯山富士山等火山便在此爭論中。

火山噴發分為2類:「岩漿噴發」與「蒸汽爆炸」(蒸汽爆炸,即岩漿的熱量將其上方的地下水膨脹成水蒸氣,將聚集在火山口的岩石爆炸或吹飛。較難以發現前兆且可能短時間內多次反覆噴發。)

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