Warning! Mount Semeru Erupts Again This Afternoon (Wednesday, September 3, 2025)

Mount Semeru in East Java erupted again on Wednesday (3/9/2025) at 2:03 PM WIB. In the last week, Mount Semeru has erupted 13 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 (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 135 seconds.

(Read: BNPB Records 52 Natural Disasters in Mid-August 2023, Forest and Land Fires Dominate)

According to the MAGMA Indonesia volcano activity report, Mount Semeru''s activity level is at Level II (Alert). Seismicity observations on September 3, 2025, from 00:00-23:59 WIB, showed 52 eruption/explosion earthquakes with amplitudes of 10-22 millimeters and durations of 42-238 seconds.

Additionally, there were 2 rockfall earthquakes with amplitudes of 4-6 mm and durations of 64-113 seconds, and 6 emission earthquakes with amplitudes of 3-8 millimeters and durations of 41-76 seconds.

PVMBG urges against any activities 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 border) 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 5,945 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most, with 2,381 eruptions.

(Read: Nearly 5 Thousand Natural Disaster Incidents in Indonesia Throughout 2023, Forest and Land Fires Dominate)