Warning! Mount Semeru Erupts Again This Afternoon (Saturday, August 30, 2025)

Mount Semeru in East Java erupted again on Saturday (August 30, 2025) at 16:05 WIB. In the last week, Mount Semeru has erupted 54 times.

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

The visual eruption was not observed. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 121 seconds.

(Read: Floods Dominated Natural Disasters in Indonesia in Early 2024)

According to the MAGMA Indonesia volcano activity report, Mount Semeru''s activity level is at Level II (Alert). Seismic observations on August 30, 2025, from 00:00-23:59 WIB showed 46 eruption/explosive earthquakes with amplitudes of 10-23 millimeters and earthquake durations of 65-155 seconds.

Subsequently, there were 4 rockfall earthquakes with amplitudes of 2-8 mm and durations of 37-81 seconds, and 9 emission earthquakes with amplitudes of 2-8 millimeters and durations of 29-87 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 conduct activities within 500 meters from the riverbanks (river boundaries) along Besuk Kobokan due to the potential for hot cloud expansion and lava flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 5,898 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most with 2,363 times.

(Read: These Are the Impacts of Damage from Natural Disasters in January-March 2023)