Mount Semeru Erupted Again This Afternoon (Tuesday, 11 August 2026)
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Mount Semeru in East Java erupted again on Tuesday (11/8/2026) at 15:31 WIB. Over the past week, Mount Semeru has erupted 15 times.
According to eruption updates from the Centre for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the eruption plume was not visually observed. The Semeru eruption was still ongoing when this report was published.
(Read: Flood Points Increase in Jakarta (23 January 2026, 12:00 WIB))
Per MAGMA Indonesia volcanic activity reports, Mount Semeru remains at Activity Level III (Alert Status). Seismic monitoring on 11 August 2026 between 06:00–12:00 WIB recorded 21 eruption earthquakes with 10–27 mm amplitude and 46–82 second duration.
Additionally, 3 emission earthquakes (4–6 mm amplitude, 19.73–39 second duration), and 2 distant tectonic earthquakes (10–33 mm amplitude, 19.82–26.82 second S-P interval, 73–86 second duration) were detected.
PVMBG prohibits all activities in the southeast sector along the Besuk Kobokan valley within 13 km of the summit. Outside this zone, residents must avoid activity within 500 m of river banks along Besuk Kobokan, as pyroclastic surge and lahar flows may reach up to 17 km from the crater.
For the year 2026, MAGMA Indonesia has logged 3,892 volcanic eruptions across Indonesia. East Java's Mount Semeru accounts for the highest count with 1,592 eruptions.
(Read: Two Months of Sumatra Floods: 1,204 Fatalities, 140 Missing (Tuesday, 27 January 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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