Mount Semeru Erupted Again This Morning (Wednesday, 12 August 2026)
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Mount Semeru in East Java erupted again on Wednesday (12/8/2026) at 05.03 WIB. Over the past week, Mount Semeru has erupted 19 times.
According to eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column reached 800 meters above the peak, or 4,476 meters above sea level.
The ash column was observed white to grey with moderate intensity, drifting eastward. This eruption was recorded on seismographs with maximum amplitude 30 millimeters and 73 seconds duration.
(Read: Volcano Eruption Trends in Recent Years)
Per MAGMA Indonesia volcanic activity reports, Mount Semeru activity status is set at Level III (Alert). Seismic monitoring on 12 August 2026 between 18.00-23.59 WIB recorded 33 eruption earthquakes with 10-22 mm amplitude and 56-131 seconds duration.
Additionally, 2 collapse earthquakes (2 mm amplitude, 43-44 seconds duration) and 6 emission earthquakes (3-7 mm amplitude, 36-53 seconds duration) were detected.
PVMBG advises against all activities in the southeast sector along Besuk Kobokan within 13 km of the summit. Outside this zone, public activity is prohibited within 500 meters of river banks along Besuk Kobokan, as areas up to 17 km from the peak face risks from pyroclastic surge expansion and lahar flows.
During 2026, MAGMA Indonesia has logged 3,907 volcanic eruptions across Indonesia. East Java's Mount Semeru recorded the highest activity with 1,596 eruptions.
(Read: 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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