Mount Semeru Erupts Again This Morning (Tuesday, September 9, 2025)

Mount Semeru in East Java erupted again on Tuesday (9/9/2025) at 05.08 AM Western Indonesia Time. In the last week, Mount Semeru has erupted 12 times.

Citing 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.

Eruption visuals were not observed. Mount Semeru''s eruption is still ongoing as this report is being made.

(Read: Bekasi Among Top 10 Highest Flood Risk Areas in West Java)

According to MAGMA Indonesia''s volcano activity report, Mount Semeru''s activity level is at Level II (Alert). Seismicity observations on September 9, 2025, at 00.00-23.59 WIB showed 54 eruption earthquakes with amplitudes of 12-22 millimeters and earthquake durations of 56-189 seconds.

Subsequently, 5 rockfall earthquakes with amplitudes of 3-5 mm and durations of 41-68 seconds, and 14 emission earthquakes with amplitudes of 3-9 millimeters and durations of 36-65 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 of the river bank (river border) along Besuk Kobokan due to the potential for being affected by the expansion of hot clouds and lava flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 6,019 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most with 2,414 times.

(Read: BPBD: Flood Disaster Losses in West Sumatra Reach Rp108.38 Billion)