Warning! Mount Semeru Erupts Again This Afternoon (Saturday, July 26, 2025)

Mount Semeru in East Java erupted again on Saturday (26/7/2025) at 17:21 WIB (Western Indonesian Time). In the last week, Mount Semeru has erupted 24 times.

Citing eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column height reached 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 144 seconds.

(Read: 137 Natural Disaster Incidents Recorded by End of January 2024, Floods Most Frequent)

According to MAGMA Indonesia's volcano activity report, Mount Semeru's activity level is at Level II (Alert). Seismic observations on July 26, 2025, from 00:00-23:59 WIB showed 48 eruption earthquakes with amplitudes of 10-22 millimeters and durations of 61-225 seconds.

Furthermore, there were 2 rockfall earthquakes with an amplitude of 3 mm and a duration of 60-82 seconds, and 15 emission earthquakes with amplitudes of 2-8 millimeters and durations of 41-106 seconds.

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, the public is advised not to conduct activities within 500 meters from the riverbanks along Besuk Kobokan, as there is potential for being affected by the expansion of hot clouds and lava flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 5,318 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions with 2,141 occurrences.

(Read: These are the Most Frequent Natural Disasters in Indonesia Until Early September 2023)