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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.
Insights by Ground AI

46 Articles

Right

In Indonesia, the Semeru volcano has erupted on the island of Java and has thrown a kilometer-high ash cloud into the sky.The authorities in the Southeast Asian island state have now raised the warning level for the Fire Mountain to the highest level. According to the volcanic authority, the eruption began in the afternoon (local time).The ash column rose from the summit about two kilometers, it was said on Wednesday.At the same time, pyroclasti…

·Vienna, Austria
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Center

Mount Semeru on the Indonesian island of Java is currently spewing ash clouds kilometers high. The government has issued its highest alert level. More than 300 people have been evacuated.

·Hamburg, Germany
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Center

The authorities call out the highest warning level after an outbreak of Semeru on Java. Previously, the volcano had spit a kilometer-high ash column.

Right

The volcano spewed ash clouds 3,600 meters above the mountain peak - Residents of the area are urged to move at least 2.5 km away from the area

Lean Right

Authorities are now responding to many small eruptions from the Semeru volcano.

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