ring of fire

Chloe didn't know whether to scream and shout, laugh, or cry. Nevertheless, the feelings erupted from her like submarine volcano, the molten lava spewing up from the deepest of recesses, unbeknownst to all but herself, below a cool, calm blue surface. Building quietly upon itself whenever the moment arose, centuries later, she might finally break the surface.

http://en.wikipedia.org/wiki/Submarine_volcano

http://en.wikipedia.org/wiki/Ring_of_fire