Also the Kamchatka Peninsula.
Friends of ours are sail there every summer logging the migration patterns of stellar sea lions. I believe it was last year at anchor
during a night watch the boat
rocked for a couple of minutes. The crew on watch and everyone else went up on deck
but couldn't find anything to justify it. They all stayed up the rest of the night.
Next morning the deck
is covered with ash, the sea is covered with ash, and not too far away is a smoke plume coming up from the surface. They didn't investigate, they got out of there fast, but they figure a volcano must have broken the surface causing enough displacement
of the water
to rock them.