Warning! Mount Semeru Erupts Again This Morning (Tuesday, September 30, 2025)

Mount Semeru in East Java erupted again on Tuesday (September 30, 2025) at 07:36 AM WIB. In the last week, Mount Semeru has erupted 12 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 or None meters above sea level.

Visual eruption was not observed. Mount Semeru's eruption was still ongoing when this report was made.

(Read: 10 Peat Hydrology Areas Most Prone to Forest Fires in 2023)

According to MAGMA Indonesia's volcanic activity report, Mount Semeru's activity level is at Level II (Alert). Seismicity observations on September 30, 2025, from 00:00-23:59 WIB, showed 80 eruption earthquakes with amplitudes of 10-22 millimeters and earthquake durations of 60-207 seconds.

Then, 1 rockfall earthquake with an amplitude of 4 mm and a duration of 89 seconds, and 4 emission earthquakes with amplitudes of 3-8 millimeters and durations of 37-95 seconds occurred.

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 engage in activities within 500 meters from the riverbanks 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 6,461 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 2,534 occurrences.

(Read: Forest Fire Hotspots in South Sumatra Increased in Mid-October 2023)