Alert! Mount Semeru Erupted Again This Morning (Tuesday, 11 August 2026)
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Mount Semeru in East Java erupted again on Tuesday (11/8/2026) at 08:23 WIB. Over the past week, Mount Semeru has erupted 11 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 700 meters above the summit (4376 meters above sea level).
The ash column appeared white to grey with moderate intensity, drifting southeast. This eruption was recorded on seismographs with maximum amplitude 13 mm and duration of 55 seconds.
(Read: 5 Provinces With Most Peatland Wildfire Hotspots Up To August 2025)
Per MAGMA Indonesia volcanic activity reports, Mount Semeru is currently set at Activity Level III (Alert). Seismic monitoring on 11 August 2026 between 00:00-06:00 WIB recorded 23 eruption earthquakes with amplitude 12-23 mm and duration 59-137 seconds.
Additionally, 2 rockfall earthquakes (3-4 mm amplitude, 53-70 sec duration) and 10 degassing earthquakes (2-7 mm amplitude, 35-83 sec duration) were detected.
PVMBG advises: all activities are prohibited in the southeast sector along Besuk Kobokan up to 13 km from the summit. Outside this zone, public activities are forbidden within 500 meters of the Besuk Kobokan river banks, as pyroclastic surges and lahars may reach up to 17 km from the peak.
For the year 2026, MAGMA Indonesia has logged 3,885 volcanic eruptions across Indonesia. East Java's Mount Semeru recorded the highest count with 1,588 eruptions.
(Read: BNPB Recorded 52 Natural Disasters Mid-August 2023, Majority Wildfires)
"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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