Mount Semeru Erupts Again This Afternoon, Eruption Height Reaches 900 Meters Above the Peak
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Mount Semeru in East Java erupted again on Monday (12/10/2026) at 11.13 WIB. In the last week, Mount Semeru has erupted 5 times.
According to eruption data from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column height reached 900 meters above the summit (4,576 meters above sea level).
The ash column was observed white to grey with thick intensity drifting southwest. This eruption was recorded on seismograph with maximum amplitude 22 mm and duration 105 seconds.
(Read: Volcano Eruption Trends In Recent Years)
Per MAGMA Indonesia volcano activity report, Mount Semeru activity status is at Level III (Alert). Seismic monitoring on 12 October 2026 00.00-06.00 WIB recorded 25 eruption earthquakes with amplitude 12-25 mm and duration 87-242 seconds.
Additionally, 6 collapse earthquakes (1-5 mm amplitude, 27-88 sec duration) and 7 emission earthquakes (2-6 mm amplitude, 29-74 sec duration) were detected.
PVMBG warns: no activities allowed in the southeast sector along Besuk Kobokan up to 13 km from the peak. Outside this zone, avoid 500 meters from river banks along Besuk Kobokan, as pyroclastic flows and lahars may reach up to 17 km from the summit.
During 2026, MAGMA Indonesia recorded 5,066 volcanic eruptions across Indonesia. Mount Semeru (East Java) recorded the highest activity with 1,963 eruptions.
(Read: Indonesia Has The Most Active Volcanoes In The World)
"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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