Mount Semeru Erupts Again Tonight (Monday, 1 June 2026)
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Mount Semeru in East Java erupted again on Monday (1/6/2026) at 19:01 WIB. Over the past week, Mount Semeru has erupted 5 times.
Based on eruption data from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column reached approximately 500 meters above the summit, or 4176 meters above sea level.
The ash column appeared white to grey with moderate intensity, drifting southwards. Mount Semeru eruption was still ongoing when this report was published.
(Read: Estimated Peatland Fire Extent in Central Kalimantan Province Over The Last Decade)
According to MAGMA Indonesia volcanic activity reports, Mount Semeru is set at Alert Level III (Standby). Seismic monitoring on 1 June 2026 between 12:00-18:00 WIB recorded 17 eruption earthquakes with amplitude 10-22 mm, duration 58-161 seconds.
Additionally, 1 rockfall earthquake (4 mm amplitude, 112 seconds duration) and 3 degassing earthquakes (5-6 mm amplitude, 40-55 seconds duration) were detected.
PVMBG advises against all activities in the southeast sector along Besuk Kobokan within 13 kilometers of the summit. Beyond this zone, residents must also avoid areas within 500 meters of river banks along Besuk Kobokan, as pyroclastic surges and lahar flows may reach up to 17 kilometers from the crater.
During 2026, MAGMA Indonesia has recorded 2267 volcanic eruptions across Indonesia. Mount Semeru recorded the highest number with 1138 eruptions.
(Read: Wildfire Hotspots Increased In South Sumatra Mid-October 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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