Mount Semeru Erupts Again This Afternoon, Ash Column Height Around 600 Meters
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Mount Semeru in East Java erupted again on Wednesday (12/8/2026) at 13.44 WIB. In the past week, Mount Semeru has erupted 27 times.
According to eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column height is around 600 meters above the peak or 4,276 meters above sea level.
The ash column was observed white to grey with moderate intensity heading southwest. Mount Semeru eruption was still ongoing when this report was published.
(Read: Nearly 5 Thousand Natural Disaster Events in Indonesia Throughout 2023, Forest Fires Dominate)
According to MAGMA Indonesia volcanic activity reports, Mount Semeru activity status is at Level III (Alert). Seismic monitoring on 12 August 2026 between 06.00-12.00 WIB recorded 24 eruption earthquakes with 12-22 mm amplitude and 65-135 second duration.
Additionally, 4 collapse earthquakes with 2-5 mm amplitude and 31-68 second duration, plus 7 emission earthquakes with 2-6 mm amplitude and 34-61 second duration were detected.
PVMBG urges all activities are prohibited in the southeast sector along Besuk Kobokan, within 13 kilometers from the summit (eruption center). Outside this radius, public must avoid activities within 500 meters of river banks along Besuk Kobokan, as there is risk of hot cloud expansion and lahar flows reaching up to 17 kilometers from the peak.
During 2026, MAGMA Indonesia has recorded 3,920 volcanic eruptions across Indonesia. Mount Semeru in East Java recorded the highest number with 1,604 eruptions.
(Read: West Kalimantan Recorded Highest CO2 Emissions From Forest Fires Up To July 2023)
"Disclosure: This is an AI-generated translation of the original article. We strive for accuracy, but please note that automated translations may contain errors or slight inconsistencies."
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