Mount Semeru Erupts Again This Morning (Sunday, August 31, 2025)

Mount Semeru in East Java erupted again on Sunday (8/31/2025) at 05:53 AM WIB. In the last week, Mount Semeru has erupted 56 times.

Based on eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column height reached 900 meters above the peak or 4,576 meters above sea level.

The ash column was observed to be white to grey with thick intensity towards the south and southwest. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 102 seconds.

(Read: Indication of Forest and Land Fire Area in East Kalimantan until June 2025)

According to MAGMA Indonesia''s volcano activity report, Mount Semeru''s activity level is at Level II (Alert). Seismic observations on August 31, 2025, from 00:00-23:59 WIB showed 47 eruption earthquakes with amplitudes of 10-22 millimeters and durations of 64-171 seconds.

Additionally, there were 3 rockfall earthquakes with amplitudes of 5-7 mm and durations of 40-107 seconds, and 17 emission earthquakes with amplitudes of 4-8 millimeters and durations of 37-124 seconds.

PVMBG urges against any activity in the southeast sector along Besuk Kobokan, as far as 8 kilometers from the peak (eruption center). Beyond this distance, the public should not engage in activities within 500 meters from the riverbanks (river borders) along Besuk Kobokan, as there is a potential for hot cloud expansion and lava flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 5,903 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 2,365 events.

(Read: BNPB Records 52 Natural Disasters in Mid-August 2023, Most of Which Were Forest and Land Fires)