Mount Semeru Erupts Again Tonight, Ash Column Height 900 Meters Above Summit
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Mount Semeru in East Java erupted again on Friday (12/6/2026) at 00:37 WIB. In the past week, Mount Semeru has erupted 46 times.
According to eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column reached 900 meters above the summit, or 4,576 meters above sea level.
The ash column was observed white to grey with moderate intensity heading south. The Semeru eruption was ongoing when this report was published.
(Read: Air Quality in Indonesia Slightly Improved in 2021)
Per MAGMA Indonesia volcanic activity reports, Mount Semeru activity status is set at Level III (Alert). Seismic monitoring on 12 June 2026 between 18:00–23:59 WIB recorded 20 eruption earthquakes with 10–22 mm amplitude and 72–129 second duration.
Additionally, 4 rockfall earthquakes (1–4 mm amplitude, 40–65 sec duration) and 7 emission earthquakes (2–5 mm amplitude, 41–64 sec duration) were detected.
PVMBG urges all activities are prohibited in the southeast sector along Besuk Kobokan within 13 km of the summit. Outside this zone, no activities are allowed within 500 m of riverbanks along Besuk Kobokan, as pyroclastic surges and lahar may reach up to 17 km from the summit.
During 2026, MAGMA Indonesia recorded 2,553 volcanic eruptions across Indonesia. East Java's Mount Semeru recorded the highest count with 1,235 eruptions.
(Read: Jakarta Air Quality Ranked 3rd Worst Globally This Morning (Tuesday, 6 June 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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