Warning! Mount Semeru Erupts Again This Afternoon (Thursday, April 17, 2025)

Mount Semeru in East Java erupted again on Thursday, April 17, 2025, at 2:45 PM WIB. In the last week, Mount Semeru has erupted 53 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 at approximately 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 21 millimeters and a duration of 72 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 17, 2025, from 00:00 to 23:59 WIB, showed 61 eruption quakes with amplitudes of 10-22 millimeters and durations of 51-154 seconds.

Furthermore, there were 9 emission quakes with amplitudes of 3-8 millimeters and durations of 27-64 seconds, and 1 harmonic tremor with an amplitude of 8 millimeters and a duration of 134 seconds.

The 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 edge) 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 2,911 volcanic eruptions/eruptions throughout Indonesia. Mount Semeru in East Java had the most eruptions, with 1,326.