Warning! Mount Semeru Erupted Again This Morning (Monday, 1 June 2026)
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Mount Semeru in East Java erupted again on Monday (1/6/2026) at 06.09 WIB. Over the past week, Mount Semeru has erupted 3 times.
Referring to eruption data from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column reached approximately 800 meters above the peak, or 4476 meters above sea level.
The ash column appeared white to grey, with thick density drifting southwest. This eruption was recorded on seismographs with maximum amplitude 23 mm and duration of 115 seconds.
(Read: Floods & Landslides in West Sumatra Claimed 200 Lives, Here Is The Distribution (4 December 2025))
Per MAGMA Indonesia volcanic activity reports, Mount Semeru is currently set at Activity Level III (Alert). Seismic monitoring between 00.00-06.00 WIB on 1 June 2026 recorded 17 eruption earthquakes with amplitude 10-22 mm and duration 93-194 seconds.
Additionally, 5 emission earthquakes (amplitude 2-4 mm, duration 36-45 seconds) and 1 harmonic tremor (amplitude 1 mm, duration 79 seconds) were detected.
PVMBG advises: NO activities are permitted in the southeast sector along Besuk Kobokan within 13 km of the summit. Outside this zone, residents must also avoid activity within 500 meters of river banks along Besuk Kobokan, as this area is at risk of pyroclastic surges and lahar flows reaching up to 17 km from the peak.
As of 2026, MAGMA Indonesia has logged 2,258 volcanic eruptions across Indonesia. Mount Semeru (East Java) recorded the highest activity, with 1,136 eruptions.
(Read: Floods Were The Most Frequent Natural Disaster in Indonesia for Q1 2026)
"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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