Mount Semeru Erupts Again Early This Morning (Sunday, October 26, 2025)

Mount Semeru in East Java erupted again on Sunday (October 26, 2025) at 03:56 AM Western Indonesia Time (WIB). In the last week, Mount Semeru has erupted 38 times.

Based on eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column reached 700 meters above the peak (4,376 meters above sea level).

The ash column was observed to be white to grey with thick intensity towards the southwest. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 164 seconds.

(Read: Number of Earthquake Disaster Victims in Indonesia in 2020-2024)

According to MAGMA Indonesia's volcanic activity report, Mount Semeru's activity level is at Level II (Alert). Seismicity observations on October 26, 2025, from 00:00-23:59 WIB, showed 39 eruption/explosion earthquakes with amplitudes of 10-22 millimeters and durations of 68-174 seconds.

Additionally, there were 13 rockfall earthquakes with amplitudes of 2-5 mm and durations of 37-132 seconds, and 3 solfataric earthquakes with amplitudes of 5-7 millimeters and durations of 49-63 seconds.

PVMBG urges people not to carry out any activities 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 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 6,778 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most, with 2,678 eruptions.

(Read: 5.3 M Earthquake Shakes 17 Km West of Pasuquin,)