Mount Semeru Erupts Again Tonight (Monday, February 9, 2026)

Mount Semeru in East Java erupted again on Monday (February 9, 2026) at 18:32 WIB. In the past week, Mount Semeru has erupted 9 times.

Quoting eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column height reached 900 meters above the peak (4,576 meters above sea level).

The ash column was observed to be white to gray with moderate intensity heading north. The eruption of Mount Semeru was still ongoing when this report was made.

(Read: 4.5 M Earthquake Shakes 94 Km Southwest of Banda Aceh,)

According to the MAGMA Indonesia volcanic activity report, the activity level of Mount Semeru is at Level III (Alert). Seismic observations on February 9, 2026 from 12:00-18:00 WIB showed 20 eruption/explosion earthquakes with amplitudes of 10-22 millimeters and durations of 45-134 seconds.

Then, 3 emission earthquakes with amplitudes of 2-4 millimeters and durations of 30-38 seconds, as well as 1 volcanic flood earthquake with an amplitude of 10 millimeters and a duration of 3720 seconds.

PVMBG advises against any activities in the southeast sector along the Besuk Kobokan, up to 13 kilometers from the peak (eruption center). Outside that distance, residents should not carry out activities within 500 meters of the riverbank along the Besuk Kobokan due to the potential for being affected by expanding hot clouds and lahar flows up to 17 kilometers from the peak.

During 2026, MAGMA Indonesia has recorded 534 volcanic eruptions across Indonesia. Mount Semeru in East Java has the most eruptions with 276 events.

(Read: 5.5 M Earthquake Shakes 262 Km East of Levuka,)