Mount Semeru Erupted Again This Morning (Tuesday, 18 August 2026)
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Mount Semeru in East Java erupted again on Tuesday (18/8/2026) at 05:32 WIB. Over the past week, Mount Semeru has erupted 6 times.
According to eruption data from the Centre for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column height reached around 500 metres above the summit, or 4,176 metres above sea level.
The ash column appeared white to grey, with thick intensity drifting northward. This eruption was recorded on seismographs with a maximum amplitude of 22 millimetres and lasted 137 seconds.
(Read: Nearly 300 Natural Disasters Recorded Up to Mid-February 2024)
Per MAGMA Indonesia volcanic activity reports, Mount Semeru is currently at Activity Level III (Alert). Seismic monitoring between 00:00–06:00 WIB on 18 August 2026 detected 30 eruption earthquakes with 15–22 mm amplitude and 70–140 second duration.
Additionally, 4 rockfall earthquakes (2–15 mm amplitude, 56–114 seconds) and 1 degassing earthquake (5 mm amplitude, 71 seconds) were registered.
PVMBG advises against all activities in the southeast sector along the Besuk Kobokan valley within 13 kilometres of the summit. Outside this zone, residents must avoid areas within 500 metres of river banks along Besuk Kobokan, as pyroclastic surges and lahars may reach up to 17 kilometres from the crater.
During 2026, MAGMA Indonesia has logged 4,082 volcanic eruptions across the country. East Java's Mount Semeru accounts for the highest activity with 1,649 recorded eruptions.
(Read: 137 Natural Disaster Events Before Late January 2024: Floods Most Frequent)
"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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