Mount Semeru Erupts Again Tonight (Saturday, 12 September 2026)
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Mount Semeru in East Java erupted again on Saturday (12/9/2026) at 19:09 WIB. Over the past week, Semeru has erupted 40 times.
According to eruption data from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia app, the observed ash column reached approx 900?m above the summit (4576?m above sea level).
The ash column appeared white to grey, thick, drifting northeast. This eruption registered on seismographs with maximum amplitude 23?mm and 140?second duration.
(Read: 1,836 Health Workers Support Wildfire Response in 7 Provinces)
Per MAGMA Indonesia activity reports, Mount Semeru remains at Alert Level?III. Seismic monitoring 12:00–18:00 WIB 12?Sep?2026 recorded 26 eruption earthquakes (13–23?mm amplitude, 78–182?s duration), 5 rockfall earthquakes (2–8?mm, 35–94?s), and 3 gas emission earthquakes (2–7?mm, 34–65?s).
PVMBG prohibits all activities in the southeast sector along Besuk Kobokan within 13?km of the summit. Outside this zone, stay 500?m back from Besuk Kobokan river banks: pyroclastic flows and lahar may reach 17?km from the peak.
During 2026 so far, MAGMA Indonesia logged 4,600 volcanic eruptions nationwide. East Java's Mount Semeru is the most active, with 1,794 recorded eruptions.
(Read: 53 Aircraft Deployed For Wildfire Control In 6 Priority Provinces)
"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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