Warning! Mount Semeru Erupts Again This Morning (Thursday, August 28, 2025)

Mount Semeru in East Java erupted again on Thursday (8/28/2025) at 10:36 AM WIB. In the last week, Mount Semeru has erupted 28 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 or None meters above sea level.

No visual eruption was observed. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 112 seconds.

(Read: Jakarta''s Air Quality This Morning is the Third Worst in the World (Tuesday, June 6, 2023))

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 earthquakes with amplitudes of 12-22 millimeters and durations of 54-182 seconds.

In addition, there were 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.

PVMBG urges people not to carry out any activities in the southeast sector along Besuk Kobokan, as far as 8 kilometers from the peak (eruption center). Beyond that distance, the public is advised not to conduct activities within 500 meters from the riverbanks (river borders) along Besuk Kobokan due to the potential for being affected by the expansion of hot clouds and lava flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 5,845 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions with 2,337 occurrences.

(Read: Not Jakarta, These are the Regions with the Worst Air Quality in Indonesia (Wednesday, June 7, 2023))