Mount Semeru Erupted Again This Afternoon (Monday, June 1, 2026)
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Mount Semeru in East Java erupted again on Monday (1/6/2026) at 16:44 WIB. In the last week, Mount Semeru has erupted 4 times.
According to eruption data from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column reached approx 500 meters above the summit (4,176 meters above sea level).
The ash column was grey, thick, drifting southward. This eruption registered on seismographs with 22 mm maximum amplitude and 131 second duration.
(Read: Floods & Forest Fires: Most Frequent Disasters in Indonesia During 2025)
Per MAGMA Indonesia volcanic activity reports, Mount Semeru is at Activity Level III (Alert). Seismic monitoring on 1 June 2026 06:00–12:00 WIB recorded 18 eruption earthquakes (12–22 mm amplitude, 69–140 second duration).
Additionally: 4 emission earthquakes (2–7 mm amplitude, 42–62 second duration), and 1 distant tectonic earthquake (12 mm amplitude, 16s S-P interval, 44 second duration).
PVMBG prohibits all activity in the southeast sector along Besuk Kobokan within 13 km of the summit. Outside this zone, public activity is forbidden within 500 meters of Besuk Kobokan river banks – this area is at risk of pyroclastic surges and lahar flows reaching up to 17 km from the summit.
During 2026 so far, MAGMA Indonesia has logged 2,263 volcanic eruptions across Indonesia. Mount Semeru (East Java) has recorded the highest activity, with 1,137 eruptions.
(Read: Distribution of Fatalities from Floods & Landslides in West Sumatra (9 December 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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