Alert! Mount Semeru Erupts Again Tonight (Wednesday, February 11, 2026)

Mount Semeru in East Java erupted again on Wednesday (February 11, 2026) at 00:28 WIB. In the past week, Mount Semeru has erupted 20 times.

Quoting eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the observed ash column height is approximately 600 meters above the peak or 4,276 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: Trends in Volcanic Eruptions in Recent Years)

According to the MAGMA Indonesia volcanic activity report, the activity level of Mount Semeru is at Level III (Alert). Seismic observations on February 11, 2026 from 18:00 to 23:59 WIB showed 29 eruption/explosion earthquakes with amplitudes of 11-22 millimeters and durations of 56-118 seconds.

Then, 1 collapse earthquake with an amplitude of 4 mm and duration of 25 seconds, as well as 1 harmonic earthquake with an amplitude of 10 millimeters and duration of 107 seconds.

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

Throughout 2026, MAGMA Indonesia has recorded 560 volcanic eruptions across Indonesia. Mount Semeru in East Java has the most eruptions with 287 events.

(Read: Countries with the Most Active Volcanoes in the World, Indonesia Ranks First)