Alert! 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 20:22 WIB. Over the past week, Mount Semeru has erupted 41 times.
According to eruption data from the Centre for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column reached 300 meters above the summit (3,976 meters above sea level).
The ash column appeared white to grey with thin intensity, drifting north. This eruption was recorded on seismographs with maximum amplitude 25 millimetres and duration of 127 seconds.
(Read: Jakarta Air Quality Ranked Second Worst Globally This Morning (Friday, 17 June 2022))
Per MAGMA Indonesia volcanic activity reports, Mount Semeru is currently at Activity Level III (Alert). Seismic monitoring on 12 September 2026 between 12:00-18:00 WIB recorded 26 eruption earthquakes with 13-23 mm amplitude and 78-182 second duration.
Additionally, 5 rockfall earthquakes (2-8 mm amplitude, 35-94 second duration) and 3 emission tremors (2-7 mm amplitude, 34-65 second duration) were detected.
PVMBG advises against all activities in the southeast sector along Besuk Kobokan within 13 km of the summit. Outside this zone, public activity is prohibited within 500 meters of river banks along Besuk Kobokan, as pyroclastic flows and lahars may reach up to 17 km from the summit.
For the year 2026, MAGMA Indonesia has logged 4,602 volcanic eruptions across Indonesia. Mount Semeru (East Java) recorded the highest number at 1,795 eruptions.
(Read: West Kalimantan Recorded Worst Air Quality in Indonesia This Morning (Friday, 18 August 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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