Four Indonesian Volcanoes Erupt on the Same Morning

At least four volcanoes erupted across Indonesia on the same morning, with activity recorded at Anak Krakatau, Mount Ibu, Ili Lewotolok and Mount Semeru by 9 a.m. local time on Sunday.

Anak Krakatau, in the Sunda Strait, had been erupting since Friday night. The Geological Agency recorded another eruption at 7:10 a.m. on Sunday, with a maximum seismic amplitude of 50 millimeters and a duration of 16 seconds. The agency said volcanic ash had spread from Bengkulu to Jakarta.

The Meteorology, Climatology and Geophysical Agency, citing information from the Center for Volcanology and Geological Hazard Mitigation, the Darwin Volcanic Ash Advisory Center and Himawari-9 satellite analysis, identified two ash dispersal patterns. One moved northeast to south, covering parts of Jakarta, Banten and West Java and nearby waters. The other moved southwest to northwest, covering parts of Banten, Lampung and Bengkulu, as well as the southern Sunda Strait and the Indian Ocean west of Bengkulu, Lampung and Banten.

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An eruption of Mount Anak Krakatau occurred on Sunday, September 6, 2026, at 7:10 a.m. local time. The eruption was recorded on a seismograph with a maximum amplitude of 50 millimeters and a duration of 16 seconds.

Mount Ibu in North Maluku erupted at 4:55 a.m. local time. Its ash column rose about 400 meters above the peak, or roughly 1,725 meters above sea level, and moved northeast. The eruption lasted 35 seconds and reached a maximum seismic amplitude of 15 millimeters.

Ili Lewotolok, in East Nusa Tenggara’s Lembata district, produced a series of eruptions over the previous 48 hours. Its strongest eruption came at 6:41 a.m., sending a thick gray ash column 600 meters above the peak, or 2,023 meters above sea level, toward the southeast. Mount Semeru in East Java erupted at 7:51 a.m., producing an ash column about 1,000 meters above its peak. The event lasted 102 seconds and registered a maximum amplitude of 23 millimeters.

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An eruption of Mount Ibu occurred on Sunday, September 6, 2026, at 4:55 a.m. local time. The observed eruption column rose approximately 400 meters above the peak, or approximately 1,725 meters above sea level. The ash column appeared gray and moved northeast with moderate intensity. The eruption was recorded on a seismograph with a maximum amplitude of 15 millimeters and a duration of 35 seconds.