Warning! Mount Semeru Erupts Again This Afternoon (Friday, September 5, 2025)

Mount Semeru in East Java erupted again on Friday (5/9/2025) at 14:22 Western Indonesian Time (WIB). In the last week, Mount Semeru has erupted 24 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 summit (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 120 seconds.

(Read: Distribution of Jakarta Flood Points (July 8, 2025, 07:00 WIB))

According to the MAGMA Indonesia volcano activity report, Mount Semeru''s activity level is at Level II (Alert). Seismicity observations on September 5, 2025, from 00:00-23:59 WIB showed 38 eruption earthquakes with amplitudes of 10-22 millimeters and durations of 41-164 seconds.

In addition, there were 3 emission earthquakes with amplitudes of 5-8 millimeters and durations of 57-80 seconds, and 2 harmonic earthquakes with amplitudes of 8-11 millimeters and durations of 190-209 seconds.

PVMBG urges against any activities in the southeast sector along Besuk Kobokan, as far as 8 kilometers from the summit (eruption center). Beyond that distance, the public should not conduct activities within 500 meters from the riverbanks (river borders) along Besuk Kobokan due to the potential for pyroclastic flows and lahar flows to extend up to 13 kilometers from the summit.

Throughout 2025, MAGMA Indonesia has recorded 5,973 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 2,392 events.

(Read: Bekasi Flood Risk Index Highest in Jabotabek)