Mount Semeru Erupts Again This Afternoon (Saturday, September 27, 2025)

Mount Semeru in East Java erupted again on Saturday (9/27/2025) at 13:45 WIB. In the last week, Mount Semeru has erupted 43 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 observed was approximately None meters above the peak (None meters above sea level).

No visual eruption was observed. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 105 seconds.

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

According to MAGMA Indonesia's volcanic activity report, Mount Semeru's activity level is at Level II (Alert). Seismicity observations on September 27, 2025, from 00:00-23:59 WIB, showed 71 eruption tremors with amplitudes of 11-22 millimeters and durations of 46-160 seconds.

Subsequently, 1 rockfall tremor with an amplitude of 5 mm and a duration of 90 seconds, and 11 gas emission tremors with amplitudes of 3-8 millimeters and durations of 39-100 seconds were recorded.

PVMBG advises against 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 borders) along Besuk Kobokan due to the potential for pyroclastic flow expansion and lava flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 6,387 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 2,509 events.

(Read: Earthquakes to Droughts, These Are the Natural Disasters That Frequently Occurred in Indonesia Until Mid-2023)