Alert! Mount Semeru Erupts Again Tonight (Sunday, 31 May 2026)
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Mount Semeru in East Java erupted again on Sunday (31/5/2026) at 21.30 WIB. Over the past week, Mount Semeru has erupted 56 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 approximately 700 meters above the crater (4,376 meters above sea level).
The ash column appeared white to grey, with thick intensity drifting southwest. This eruption was recorded on seismographs with maximum amplitude 21 mm and duration of 130 seconds.
(Read: NTT Consistently Hit By Forest Fires For 10 Years, BMKG Urges Increased Preparedness)
Per MAGMA Indonesia volcanic activity reports, Mount Semeru is currently at Activity Level III (Alert Status). Seismic monitoring on 31 May 2026 between 12.00-18.00 WIB recorded 23 eruption earthquakes with 10-22 mm amplitude and 86-140 second duration.
Additionally, 1 blowout earthquake (4 mm amplitude, 56 second duration) and 1 harmonic tremor (1 mm amplitude, 245 second duration) were detected.
PVMBG prohibits all activities in the southeast sector along the Besuk Kobokan river up to 13 km from the summit. Outside this zone, the public must avoid activity within 500 meters of river banks along Besuk Kobokan, as pyroclastic flows and lahar may reach up to 17 km from the crater.
During 2026, MAGMA Indonesia has documented 2,253 volcanic eruptions across Indonesia. East Java's Mount Semeru accounts for the highest number with 1,132 eruptions.
(Read: Nearly 5,000 Natural Disasters Recorded In Indonesia During 2023, Forest Fires Were Most Frequent)
"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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