Mount Semeru Erupts Again This Afternoon, Eruption Height Reaches 500 Meters Above Peak
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Mount Semeru in East Java erupted again on Wednesday (5/8/2026) at 11.58 WIB. Over the past week, Mount Semeru has erupted 20 times.
According to eruption data from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia app, the observed ash column height was approximately 500 meters above the peak, or 4176 meters above sea level.
The ash column appeared white to grey with moderate intensity, drifting northwards. This eruption was ongoing at the time this report was published.
(Read: Nearly 5,000 Natural Disasters Recorded in Indonesia During 2023, Forest Fires Most Frequent)
Per MAGMA Indonesia volcanic activity reports, Mount Semeru is currently set at Alert Level III (Standby). Seismic monitoring on August 5, 2026 between 00.00-06.00 WIB recorded 30 eruption earthquakes with 13-22 mm amplitude and 69-142 second duration.
Additionally, 6 rockfall earthquakes (1-4 mm amplitude, 35-59 second duration) and 1 distant tectonic earthquake (14 mm amplitude, 29 second S-P interval, 81 second total duration) were detected.
PVMBG has prohibited all activities in the southeast sector along the Besuk Kobokan valley within 13 kilometers of the summit. Outside this zone, residents must avoid activity within 500 meters of river banks along Besuk Kobokan, as this area is at risk of pyroclastic surge expansion and lahar flows reaching up to 17 kilometers from the peak.
For the year 2026, MAGMA Indonesia has logged 3733 volcanic eruptions across Indonesia. East Java's Mount Semeru accounts for the highest number with 1532 recorded eruptions.
"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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