CVGHM reported that during 1-30 April white plumes from Ijen rose 100-200 m above the crater; during 1-11 May diffuse white plumes rose 50-100 m.
From the beginning of April until 13 May the amplitude and number of earthquakes gradually decreased and the crater lake water temperature decreased by eight degrees Celsius.
The Alert Level was lowered to 2 (on a scale of 1-4) on 13 May.
Source: Center of Volcanology and Geological Hazard Mitigation (CVGHM)
Ijen (Indonesia)
