Over the last week, Rincón de la Vieja has had a few small explosions that rained ash in the area near the volcano. This is the volcano’s first bout of activity since a brief period of noise during September 2014. Neither explosion was particularly large, with a small ash plume that was less than a kilometer over the volcano.
Volcanologists from OVSICORI, the volcano monitoring agency of Costa Rica, visited Rincón de la Vieja to get a better handle on the recent unrest. What they found was a number of small ash deposits related to other steam-driven explosions that have occurred since the start of 2016 (likely small enough to go unnoticed, especially if obscured by clouds).
The most interesting thing they found was that ash from