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

Mount Semeru in East Java erupted again on Thursday (28/8/2025) at 17:36 WIB. In the last week, Mount Semeru has erupted 34 times.

Based on 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 or None meters above sea level.

Eruption visuals were not observed. Mount Semeru''s eruption was still ongoing when this report was made.

(Read: Floods Still the Most Frequent Disaster in Indonesia Until March 2025 )

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

Then, 2 rockfall earthquakes with amplitudes of 2-3 mm and earthquake durations of 42-58 seconds, and 11 gas emission earthquakes with amplitudes of 3-8 millimeters and earthquake 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, the public 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 5,856 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 2,343 occurrences.

(Read: Bekasi Among 10 Districts with Highest Flood Risk in West Java)