OVSICORI-UNA reported that periodic phreatic explosions at Rincón de la Vieja continued to be recorded by the seismic network and webcams during 13-19 May.
Some of the events were not visually confirmed by webcams because of weather conditions or darkness.
Two events, at 0524 and 0704 on 14 May produced steam plumes that rose 500 m above the crater rim.
A few events were recorded the next morning.
At 1127 on 15 May an event was characterized by local residents as a gas-and-steam plume rising 1 km above the crater rim and a gray, sediment-laden plume rising 400 m.
Events at 0604, 0644, 0819, and 0825 on 17 May produced steam plumes that rose 500 m above the rim.
Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)