Mount Semeru Erupts Again This Afternoon (Thursday, August 28, 2025)

Mount Semeru in East Java erupted again on Thursday (August 28, 2025) at 12:52 PM WIB. In the last week, Mount Semeru has erupted 30 times.

According to eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the height of the ash column was observed to be around None meters above the peak (None meters above sea level).

No visual eruption was observed. The Mount Semeru eruption was still ongoing when this report was made.

(Read: Indications of Forest and Land Fire Area in East Kalimantan until June 2025)

According to the MAGMA Indonesia volcano activity report, Mount Semeru''s activity level is at Level II (Alert). Seismicity observations on August 28, 2025, from 00:00-23:59 WIB showed 40 eruption earthquakes with amplitudes of 12-22 millimeters and earthquake durations of 54-182 seconds.

Furthermore, 2 rockfall earthquakes with amplitudes of 2-3 mm and durations of 42-58 seconds, and 11 gas emission earthquakes with amplitudes of 3-8 millimeters and durations of 41-67 seconds occurred.

PVMBG advises against any activity in the southeast sector along Besuk Kobokan, as far as 8 kilometers from the peak (eruption center). Beyond that distance, people should not engage in activities within 500 meters from the riverbanks (river borders) along Besuk Kobokan due to the potential for expansion of hot clouds and lahar up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 5,847 volcanic eruptions across Indonesia. Mount Semeru in East Java has had the most eruptions, with 2,339 events.

(Read: Due to Forest and Land Fires, Acute Respiratory Infections in South Kalimantan Reached 189 Thousand Cases as of September 2023)