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

Mount Semeru in East Java erupted again on Friday (5/9/2025) at 09:22 AM WIB. In the last week, Mount Semeru has erupted 22 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 (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 115 seconds.

(Read: Jakarta''s Air Quality This Morning is the Second Worst in the World (Friday, June 17, 2022))

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 tremors/earthquakes with amplitudes of 10-22 millimeters and durations of 41-164 seconds.

Furthermore, there were 3 exhalation tremors with amplitudes of 5-8 millimeters and durations of 57-80 seconds, and 2 harmonic tremors with amplitudes of 8-11 millimeters and durations of 190-209 seconds.

PVMBG advises against any activity 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 boundaries) 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 5,970 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most with 2,390 occurrences.

(Read: Indonesia, Country with the Worst Air Quality in Southeast Asia)