琼北第四纪火山区分布着为数众多、大小不一的射气岩浆喷发成因的低平火山口。

Maars of various scales produced by phreatomagmatic eruption are widely distributed in the Quaternary volcanic region of the Northern Hainan Island.

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工作区内琼北新生代火山共计5 9个，火山结构类型可分为火山锥、熔岩穹、熔岩湖与低平火山口等。

There are 59 Cenozoic cones, the volcanic texture of which may be classified into cone, dome, lava lake and maar.

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工作区内琼北新生代火山共计5 9个，火山结构类型可分为火山锥、熔岩穹、熔岩湖与低平火山口等。

There are 59 Cenozoic cones, the volcanic texture of which may be classified into cone, dome, lava lake and maar.

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