Mount Semeru Erupts Again Tonight (Monday, October 27, 2025)

Mount Semeru in East Java erupted again on Monday (10/27/2025) at 10:13 PM Western Indonesian Time (WIB). In the last week, Mount Semeru has erupted 6 times.

Reporting 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).

Visual eruption was not observed. The eruption was recorded on a seismograph with a maximum amplitude of 23 millimeters and a duration of 134 seconds.

(Read: 5.5 M Earthquake Shakes 262 Km East of Levuka,)

According to the MAGMA Indonesia volcanic activity report, Mount Semeru's activity level is at Level II (Alert). Seismic observations on October 27, 2025, from 00:00-23:59 WIB showed 119 eruption earthquakes with amplitudes of 10-23 millimeters and durations of 58-167 seconds.

Then, 7 rockfall earthquakes with amplitudes of 2-6 mm and durations of 47-75 seconds, and 24 exhalation earthquakes with amplitudes of 3-8 millimeters and durations of 24-71 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 conduct activities within 500 meters from the riverbanks (river borders) 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 6,796 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 2,689 occurrences.

(Read: These are the 10 Biggest Earthquakes in History, Two of Them from Indonesia)