Mount Semeru Erupts Three Times This Morning, Ash Column Reaches 1,000 Metres

Mount Semeru in Lumajang, East Java, erupted three times on Thursday morning (18 June 2026), according to the Centre for Volcanology and Geological Hazard Mitigation (PVMBG).

The first eruption occurred at 05:26 WIB, with the ash column observed reaching approximately 900 metres above the summit, or around 4,576 metres above sea level.

A second eruption followed at 06:36 WIB, producing an ash column of around 800 metres above the peak. The ash cloud was observed to be white to grey in colour.

The latest eruption took place at 06:39 WIB, with the ash column height observed at approximately 1,000 metres above the summit, or 4,676 metres above sea level. The grey-coloured ash column was drifting towards the north.