Alert! Mount Semeru Erupted Again This Morning (Friday, 11 September 2026)
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Mount Semeru in East Java erupted again on Friday (11/9/2026) at 09:45 WIB. Over the past week, Mount Semeru has erupted 23 times.
According to eruption data from the Centre for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the eruption visual was not observed. The event was recorded on seismograph with 22mm maximum amplitude and 138 seconds duration.
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Per MAGMA Indonesia volcano activity reports, Mount Semeru is set at Activity Level III (Alert). Seismic monitoring between 00:00-06:00 WIB on 11 September 2026 recorded 37 eruption earthquakes with 12-25mm amplitude and 61-144 second duration.
Additionally, 4 rockfall earthquakes (2-4mm amplitude, 44-70s duration) and 9 harmonic tremors (7-22mm amplitude, 124-406s duration) were detected.
PVMBG prohibits all activities in the southeast sector along Besuk Kobokan up to 13 km from the summit. Beyond this zone, no activity is allowed within 500m of Besuk Kobokan river banks, as pyroclastic surge and lahar flows may reach up to 17 km from the peak.
During 2026, MAGMA Indonesia has recorded 4,567 volcanic eruptions across Indonesia. Mount Semeru accounts for the highest number at 1,777 eruptions.
(Read also: 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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