Mount Semeru Erupts Again Today, Volcanic Ash Height Reaches 1,100 Meters
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Mount Semeru in East Java erupted again on Wednesday (12/8/2026) at 10:56 WIB. Over the past week, Mount Semeru has erupted 25 times.
According to eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column height was approximately 1,100 meters above the summit, or 4,776 meters above sea level.
The ash column appeared white to grey in colour, with thick intensity drifting eastwards. The eruption was recorded on seismographs with maximum amplitude 22 mm and duration of 90 seconds.
(Read: Indonesia Has The Most Active Volcanoes In The World)
Per MAGMA Indonesia volcano activity reports, Mount Semeru activity status is set at Level III (Alert). Seismic monitoring on 12 August 2026 between 00:00–06:00 WIB recorded 20 eruption earthquakes with amplitude 10–42 mm and duration 45–153 seconds.
Additionally, 1 collapse earthquake (2 mm amplitude, 85 seconds duration) and 6 emission earthquakes (5–10 mm amplitude, 43–63 seconds duration) were detected.
PVMBG urges all activities are prohibited in the southeast sector along Besuk Kobokan up to 13 km from the summit. Outside this zone, public activity is forbidden within 500 meters of river banks along Besuk Kobokan, as pyroclastic surges and lahar flows may reach up to 17 km from the summit.
During 2026, MAGMA Indonesia has logged 3,917 volcanic eruptions nationwide. East Java's Mount Semeru recorded the highest activity with 1,602 eruptions.
(Read: Countries With Most Active Volcanoes Worldwide: Indonesia Ranks First)
"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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