海底喷发是发生在海底的火山喷发。这种喷发的喷出物数量多、规模大。海底喷发一般为玄武岩质熔岩，堆积成海底高原、山脉，它们如出露水面即为岛屿。若在浅海发出喷发而又没有露出水面时，可从海水沸腾、水汽或水柱上升和海面出现浮石等现象推断海底有火山喷发。如喷发在洋底二千米以下发生，有利形成含金属或其它有用物质的热水溶液，是重要的造矿场所。
虎睛石矿床赋存于耀岭河岩组一套基性海底喷发岩系中，受北北西向的一组缓倾斜构造裂隙控制。
The tiger's eye stone's deposit layed among a set of basic submarine extrusive rocks in Yaolinghe Rock-Formation, and controled by a group of NNW inclined structure fracture.
这也是海洋形成其化学成份的例子之一：不只是从陆地上随江河流入海里，海底火山喷发时也给海洋注入新的化学成份。
This is also an example of how the ocean acquires its chemical makeup. It's not just run off from the continents, but also injection and chemical exchange caused by submarine volcanoes.
最早的生命是细菌，它们生活在滚热的海水中，那时的海底下到处喷发着火山。
The first life forms were probably bacteria which lived in very hot around underwater volcanoes.
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