当地底下的压力生成时，岩浆喷发。
火山岩透过地幔中部份熔融的软流层渗入到地壳，岩浆喷发，海山由此形成。
Seamounts form from magmatic eruptions, which occur when lava seeps up to the crust through the partially-melted sub-layer, known as the asthenosphere, in the mantle.
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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