Mount Semeru Erupts Again This Afternoon (Friday, August 29, 2025)

Mount Semeru in East Java erupted again on Friday (August 29, 2025) at 12:59 PM WIB. In the past week, Mount Semeru has erupted 45 times.

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

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

(Read: There were 137 Natural Disaster Incidents Towards the End of January 2024, Floods Were the Most Frequent)

According to MAGMA Indonesia''s volcano activity report, Mount Semeru''s activity level is at Level II (Alert). Seismicity observations on August 29, 2025, from 00:00-23:59 WIB showed 42 eruption/explosion earthquakes with amplitudes of 12-22 millimeters and earthquake durations of 64-182 seconds.

Furthermore, there were 4 rockfall earthquakes with amplitudes of 2-10 mm and durations of 6-110 seconds, and 13 emission earthquakes with amplitudes of 4-8 millimeters and durations of 43-118 seconds.

PVMBG urges 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 boundaries) along Besuk Kobokan, as there is a potential for expansion of hot clouds and lava flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 5,875 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 2,354 recorded.

(Read: Earthquakes to Droughts, These are the Natural Disasters Frequently Occurring in Indonesia Until Mid-2023)