Four Volcanoes in Indonesia Erupt Simultaneously This Morning
Several volcanoes in Indonesia erupted on the same day. As of Sunday (6/9) at 09:00 WIB, at least four volcanoes were erupting: Mount Anak Krakatau, Mount Ibu, Mount Illi Lewotolok, and Mount Semeru.
The locations of the four are widespread: Mount Anak Krakatau in the Sunda Strait, Mount Semeru in East Java, Mount Illi Lewotolok in East Nusa Tenggara, and Mount Ibu in West Halmahera.
- Mount Anak Krakatau
Mount Anak Krakatau has been erupting since Friday (4/9) night through to Sunday (6/9). Volcanic ash from Mount Anak Krakatau has been recorded spreading from Bengkulu to Jakarta.
“An eruption of Mt. Anak Krakatau occurred on Sunday, 06 September 2026, at 07:10 WIB. The eruption was recorded on the seismograph with a maximum amplitude of 50 mm and a duration of 16 seconds,” wrote the Geological Agency of the Ministry of Energy and Mineral Resources on Sunday (6/9).
The Meteorology, Climatology, and Geophysics Agency (BMKG) stated that, based on information from PVMBG, VAAC Darwin, and analysis of Himawari-9 RGB imagery, the distribution of volcanic ash from Mount Anak Krakatau is divided into two paths.
The first path moves towards the northeast-south, covering parts of DKI Jakarta, Banten, West Java, and surrounding waters. The second path moves towards the southwest-northwest, covering parts of Banten, Lampung, Bengkulu, the southern Sunda Strait, and the Indian Ocean west of Bengkulu-Lampung-Banten.
- Mount Ibu
Mount Ibu in North Maluku Province was also reported to have erupted on Sunday (6/9).
The Geological Agency of the Ministry of Energy and Mineral Resources noted that the eruption column reached approximately 400 metres above the peak, or about 1,725 metres above sea level. The ash column was observed to be grey with moderate intensity moving towards the northeast.
“An eruption of Mt. Ibu occurred on Sunday, 06 September 2026, at 04:55 WIT. The eruption column height was observed at ± 400 m above the peak (± 1725 m above sea level). The ash column was observed to be grey with moderate intensity towards the northeast. The eruption was recorded on the seismograph with a maximum amplitude of 15 mm and a duration of 35 seconds,” the Geological Agency stated in its release on Sunday (6/9).
- Mount Illi Lewotolok
Mount Ili Lewotolok in Lembata Regency, East Nusa Tenggara, has experienced a series of eruptions within the last 48 hours.
The strongest eruption occurred on Sunday (6/9) at 06:41 WITA, with the ash column reaching 600 metres above the peak, equivalent to 2,023 metres above sea level. A thick grey ash column was observed leaning towards the southeast, recorded on the seismograph with a maximum amplitude of 40 mm and a duration of 82 seconds.
- Mount Semeru
Mount Semeru in East Java erupted on Sunday (6/9) at 07:51 WIB. The ash column height was observed to reach approximately 1,000 metres above the peak. According to reports from the Geological Agency, the eruption was recorded on the seismograph with a maximum amplitude of 23 millimetres and a duration of 102 seconds.
The Geological Agency has also requested that residents near Mount Semeru refrain from any activities in the southeastern sector along Besuk Kobokan, up to 13 km from the peak (the centre of the eruption).
“Outside of that distance, the public should not engage in activities within 500 metres of the riverbanks along Besuk Kobokan due to the potential for expanding hot clouds and lava flows up to 17 km from the peak,” wrote the Geological Agency.