Mount Semeru Erupts Again This Afternoon, Ash Column Height 400 Meters Above Summit
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Mount Semeru in East Java erupted again on Wednesday (29/4/2026) at 17.17 WIB. Over the past week, Mount Semeru has erupted 25 times.
According to eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column height is approximately 400 meters above the summit (4,076 meters above sea level).
The ash column appeared white to grey with moderate intensity, drifting southward. Mount Semeru's eruption was ongoing when this report was published.
(Read: Nearly 5 Thousand Natural Disaster Events in Indonesia Throughout 2023, Forest Fires Dominated)
Per MAGMA Indonesia volcanic activity reports, Mount Semeru activity status is set at Level III (Alert). Seismic monitoring on 29 April 2026 06.00-12.00 WIB recorded 21 eruption earthquakes with amplitude 15-22 mm and duration 60-123 seconds.
Additionally, 1 harmonic tremor (2 mm amplitude, 162 second duration) and 1 distant tectonic earthquake (35 mm amplitude, 13 sec S-P interval, 70 sec duration) were detected.
PVMBG advises against all activities in the southeast sector along Besuk Kobokan within 13 kilometers of the summit eruption center. Outside this radius, residents are prohibited from activities within 500 meters of Besuk Kobokan river banks, as these areas are at risk of pyroclastic surge expansion and lahar flows reaching up to 17 kilometers from the summit.
During 2026, MAGMA Indonesia has logged 1,727 volcanic eruptions across Indonesia. East Java's Mount Semeru recorded the highest activity with 895 eruptions.
(Read: Floods and Forest Fires: Most Frequent Disasters in Indonesia Throughout 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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