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I oppose a merger simply because not all submarine eruptions come from submarine volcanoes. Submarine eruptions can also occur when lava tubes empty into oceans from subaerial volcanoes, especially those forming islands. Volcanoguy12:27, 22 June 2015 (UTC)Reply
You're not addressing the undesirable duplication between submarine volcano and submarine eruption. As you said, submarine eruptions not from submarine volcanoes is a secondary topic. These could be described in submarine eruptions so long as there's a hatnote stating {{for|the most common origin of submarine eruptions|Submarine volcanoes and their eruptions}}. (BTW: subaerial volcano is missing). Fgnievinski (talk) 18:21, 22 June 2015 (UTC)Reply
How common are underwater lava tubes eruptions from subaerial eruptions? Such exceptions could easily be covered with a note in a merged Submarine volcano article. Seems rather hair splitting stuff. And when a submarine volcano breaks the surface and a new island is born (sometimes only temporary) and continues with both submarine and subaerial eruptions... Vsmith (talk) 22:57, 22 June 2015 (UTC)Reply