Mount Semeru Erupted Again This Afternoon (Wednesday, 12 August 2026)
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Mount Semeru in East Java erupted again on Wednesday (12/8/2026) at 16:57 WIB. Over the past week, Mount Semeru has erupted 29 times.
According to eruption data from the Centre for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column reached approx 500 m above the peak, or 4176 m above sea level.
The ash column appeared white to grey with moderate intensity, drifting southwest. This eruption was ongoing at time of reporting.
(Read: Magnitude 4.8 Earthquake Strikes 219 km East of Levuka,)
Per MAGMA Indonesia volcanic activity reports, Mount Semeru is set at Alert Level III (Standby). Seismic monitoring on 12 August 2026 between 06:00-12:00 WIB recorded 28 eruption earthquakes (12-22 mm amplitude, 65-135 second duration).
Additionally 4 rockfall quakes (2-5 mm amplitude, 31-68 sec duration) and 7 degassing tremors (2-6 mm amplitude, 34-61 sec duration) were detected.
PVMBG advises strictly no activities in the southeast sector along Besuk Kobokan within 13 km of the summit. Outside this zone, stay 500 m away from river banks along Besuk Kobokan: pyroclastic surges and lahars may reach up to 17 km from the peak.
During 2026, MAGMA Indonesia logged 3,927 volcanic eruptions nationwide. East Java's Mount Semeru recorded the highest activity with 1606 eruptions.
(Read: Magnitude 4.6 Earthquake Strikes 128 km North of Lae, Papua)
"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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