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Indonesia raises alert for Mount Semeru volcano to the highest level after a series of eruptions

Authorities evacuated thousands as Mount Semeru emitted pyroclastic flows and a 54,000-foot ash cloud, prompting a top-level alert and a red aviation warning from Australia VAAC.

  • On Wednesday, Indonesian authorities raised Mount Semeru's alert to the highest level after eruptions blanketed several villages with ash, the Geological Agency showed volcanic material over Lumajang, East Java.
  • Despite the risks, Indonesia sits on the Pacific 'Ring of Fire,' with over 270 million people and many living on Mount Semeru's fertile slopes, which erupts frequently.
  • Video and seismograph data show Mount Semeru erupted three times early today at 4.10am, 5.09am and 6.05am, with ash plumes reaching roughly 500 metres and pyroclastic avalanches traveling up to 7 kilometers, while seismographs recorded strong signals, including a maximum amplitude of 22mm and a duration of 142 seconds.
  • Thousands have been evacuated to secure locations, Lumajang Regency BPBD Rapid Response Team patrolled and moved elderly people, authorities reported no casualties while The Foreign Office warned against travel to exclusion zones.
  • The Australia Volcanic Ash Advisory issued a red aviation warning after ash climbed to 54,000ft, and authorities listed Besuk Kobokan, Besuk Bang, Besuk Kembar, and Besuk Sat as likely affected valleys.
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Indonesia's Mount Semeru erupted, spewing ash and sending lava flows miles away, forcing the evacuation of three high-risk villages.

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In the east of the Indonesian island of Java the volcano Semeru has erupted, which is only about 300 kilometers from the popular holiday island of Bali. The authorities proclaimed the highest warning level.

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Fox Weather broke the news in on Wednesday, November 19, 2025.
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