2018-12-24 18:36:10 UTC
because of a tsunami that struck without warning.
Some of the articles noted that the tsunami was caused by a volcanic eruption.
One article I encountered named the volcano.
Apparently the pressure has been building up, and it had to let out a tiny little
belch. It could well be, though, that a more major eruption from that volcano is a
possibility in the relatively near future.