Mount Semeru Erupted Again This Afternoon, Volcanic Ash Height Around 1,000 Meters
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Mount Semeru in East Java erupted again on Thursday (18/6/2026) at 13:31 WIB. Over the past week, Mount Semeru has erupted 43 times.
According to eruption data from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia app, observed ash column height reached approx 1,000 meters above the summit, or 4,676 meters above sea level.
The ash column appeared white to grey, with thick density drifting southwest. This eruption was registered on seismographs with maximum 22 mm amplitude and 199 seconds duration.
(Read: NTT Continually Affected By Forest Fires Last 10 Years, BMKG Urges Increased Preparedness)
Per MAGMA Indonesia volcanic activity reports, Mount Semeru status remains at Level III (Alert). Seismic monitoring on 18 June 2026 between 06:00-12:00 WIB recorded 19 eruption earthquakes with 12-22 mm amplitude and 54-139 second duration.
Additionally: 1 explosion earthquake at 6 mm amplitude / 54 sec, plus 1 harmonic tremor at 5 mm amplitude / 55 sec duration.
PVMBG prohibits all activity in the southeast sector along Besuk Kobokan within 13 km of the summit. Outside this zone, public must avoid all activity within 500 m of river banks along Besuk Kobokan, as pyroclastic surges and lahar flows may reach up to 17 km from the crater.
For 2026 so far, MAGMA Indonesia has logged 2,775 volcanic eruptions across Indonesia. East Java's Mount Semeru accounts for the highest count with 1,294 eruptions.
(Read: Forest Fire Extent Indicators for West Kalimantan Province, 2016-2025)
"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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