Mount Semeru Erupts Again This Evening (Monday, April 21, 2025)

Mount Semeru in East Java erupted again on Monday, April 21, 2025, at 3:28 PM WIB. In the last week, Mount Semeru has erupted 16 times.

According to 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 of Mount Semeru was still ongoing at the time of this report.

According to the MAGMA Indonesia volcano activity report, Mount Semeru's activity level is at Level II (Alert). Observations of seismic activity on April 21, 2025, from 00:00 to 23:59 WIB showed 45 eruption quakes with amplitudes of 10-23 millimeters and durations of 63-183 seconds.

Furthermore, there was 1 rockfall quake with an amplitude of 5 mm and a duration of 72 seconds, and 8 emission quakes with amplitudes of 2-9 millimeters and durations of 45-68 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, the public should not engage in activities within 500 meters of the riverbank (riverbed) along Besuk Kobokan due to the potential for the expansion of pyroclastic flows and lahars up to 13 kilometers from the peak.

During 2025, MAGMA Indonesia has recorded 3,091 volcanic eruptions/eruptions throughout Indonesia. Mount Semeru in East Java has experienced the most eruptions, with 1,365 eruptions.