Mount Semeru Erupted Again Early This Morning, Ash Column Reaches 200 Meters Above Peak
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Mount Semeru in East Java erupted again on Tuesday (22/9/2026) at 02.30 WIB. This marks its 4th eruption in the past week.
According to eruption data from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column reached approximately 200 meters above the summit (3,876 meters above sea level).
The ash column appeared white to grey, thick, drifting northeast. This eruption registered on seismographs with maximum amplitude 22 mm and duration 105 seconds.
(Read: Jatibening Listed Among 15 Areas With Best Air Quality in Indonesia As Of September 2023)
Per MAGMA Indonesia volcano activity reports, Mount Semeru is set at Alert Level III. Seismic monitoring on 22 September 2026 18.00-23.59 WIB recorded 39 eruption earthquakes (amplitude 10-22 mm, duration 62-144 sec), 16 rockfall earthquakes, and 3 gas emission earthquakes.
PVMBG prohibits all activities in the southeast sector along Besuk Kobokan up to 13 km from the peak, plus no activity within 500 m of river banks along this valley due to pyroclastic flow and lahar risks up to 17 km from the summit.
For 2026 so far, MAGMA Indonesia logged 4,743 volcanic eruptions nationwide; Mount Semeru recorded the highest count at 1,841 eruptions.
(Read: Chad Ranked As Country With Worst Air Quality In The World 2024)
"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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