Mount Semeru Erupts Again This Afternoon (Sunday, October 5, 2025)

Mount Semeru in East Java erupted again on Sunday (10/5/2025) at 1:05 PM WIB. In the last week, Mount Semeru has erupted 38 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 reach None meters above the peak or None meters above sea level.

The eruption's visuals were not observed. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 122 seconds.

(Read: Volcanic Eruption Trends in Recent Years)

According to MAGMA Indonesia's volcanic activity report, Mount Semeru's activity level is at Level II (Alert). Seismicity observations on October 5, 2025, from 00:00-23:59 WIB showed 89 eruption/explosion earthquakes with amplitudes of 10-22 millimeters and durations of 50-161 seconds.

Subsequently, 5 times of exhalation earthquakes with amplitudes of 5-8 millimeters and durations of 36-60 seconds, and 1 deep volcanic earthquake with an amplitude of 25 millimeters s-p 3.3 seconds and a duration of 20 seconds occurred.

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, people 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 6,541 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most with 2,560 times.

(Read: Countries with the Most Active Volcanoes in the World, Indonesia Ranks First)