Mount Semeru Erupts Again Tonight (Thursday, April 17, 2025)

Mount Semeru in East Java erupted again on Thursday, April 17, 2025, at 9:25 PM WIB. In the last week, Mount Semeru has erupted 60 times.

According to eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the ash column height was observed to be approximately 700 meters above the peak (4,376 meters above sea level).

The ash column was observed to be white to gray with moderate intensity towards the southwest. The eruption of Mount Semeru was still ongoing at the time of this report.

According to the MAGMA Indonesia volcano activity report, the activity level of Mount Semeru is at Level II (Alert). Seismic observations 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 puffing 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.

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 carry out 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 2,923 volcanic eruptions/eruptions throughout Indonesia. Mount Semeru in East Java has experienced the most eruptions, with 1,333 eruptions.