3 Havre Seamount, Kermadec Islands (105)
Considering no one actually noticed the eruption happening until weeks after it was over, Havre makes an impressive showing in the 2012 Pliny rundown. I'm, of course, partial to the eruption as I had a role in tracking down the source of the large pumice raft that was discovered in the Kermadec Islands north of New Zealand during early August. It turns out that the pumice came from a seamount that had not been recognized as an active submarine volcano (it didn't even appear in the Global Volcanic Program database - it does now) - one of three eruptions in/near New Zealand in the course of a few weeks of late July to early August. (see #4 Tongariro and #9 White Island).
Image: The plume and early pumice raft from Havre seamount, seen on July 19, 2012. NASA Earth Observatory.
