Warning! Mount Semeru Erupts Again This Afternoon (Sunday, April 20, 2025)

Mount Semeru in East Java erupted again on Sunday, April 20, 2025, at 1:15 PM WIB. In the last week, Mount Semeru has erupted 86 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 was observed to reach None meters above the peak or None meters above sea level.

The eruption was not visually observed. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 103 seconds.

According to the MAGMA Indonesia volcano activity report, Mount Semeru's activity level is at Level II (Alert). Observations of seismic activity on April 20, 2025, from 00:00 to 23:59 WIB showed 52 eruption quakes with amplitudes of 12-23 millimeters and durations of 58-248 seconds.

Furthermore, there were 11 puffing quakes with amplitudes of 2-8 millimeters and durations of 42-85 seconds, and 1 deep volcanic quake with an amplitude of 8 millimeters, s-p 1.8 seconds, and a duration of 13 seconds.

PVMBG advises against any activity in the southeast sector along Besuk Kobokan, up to 8 kilometers from the peak (eruption center). Outside this distance, people should not engage in activities within 500 meters of the riverbank (river buffer zone) along Besuk Kobokan due to the potential for pyroclastic flow and lahar flows extending up to 13 kilometers from the peak.

During 2025, MAGMA Indonesia has recorded 3,046 volcanic eruptions/eruptions throughout Indonesia. Mount Semeru in East Java has experienced the most eruptions, with 1,359 eruptions.