Warning! Mount Semeru Erupts Again This Afternoon (Tuesday, September 2, 2025)

Mount Semeru in East Java erupted again on Tuesday (2/9/2025) at 3:56 PM WIB. In the last week, Mount Semeru has erupted 7 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 140 seconds.

(Read: Jakarta and Medan, World''s Worst Polluted Cities, Here''s Their Air Quality Trend)

According to MAGMA Indonesia''s volcano activity report, Mount Semeru''s activity level is at Level II (Alert). Seismicity observations on September 2, 2025, from 00:00-23:59 WIB showed 45 eruption/explosion earthquakes with amplitudes of 10-22 millimeters and earthquake durations of 54-185 seconds.

Subsequently, 3 rockfall earthquakes with amplitudes of 2-8 mm and durations of 54-71 seconds, and 9 emission earthquakes with amplitudes of 3-8 millimeters and durations of 43-115 seconds occurred.

PVMBG advises against any activities 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 borders) along Besuk Kobokan due to the potential for expansion of hot clouds and lava flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 5,929 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 2,375 times.

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