Yes. Underwater volcanoes exist along ocean ridges (areas where material for new sea floor is produced) and all oceans have at least one of these. In these areas, tectonic plates (vast areas of earth crust) are actually spreading away from each other and expanding as the underwater volcanoes spew new molten material.
However, the Pacific Ocean has a distinction. While there is a ridge in its southeastern portion, most of the Pacific is known for earth destruction, not earth formation. Around the Pacific's rim are the world's most extensive subduction zones, or areas where old crust is forced deep into the earth's mantle where it is destroyed. This is part of what makes areas like coastal California and Japan so prone to earthquakes.
---David Murphy
