Mount Semeru Erupts Again Early This Morning (Wednesday, March 11, 2026)

Mount Semeru in East Java erupted again on Wednesday (March 11, 2026) at 04:04 WIB. In the past week, Mount Semeru has erupted 32 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 around 400 meters above the peak or 4,076 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 March 11, 2026 from 18:00 to 23:59 WIB showed 20 eruption/explosion earthquakes with an amplitude of 13-22 millimeters and a duration of 76-168 seconds. Then, 1 emission earthquake with an amplitude of 5 millimeters and a duration of 37 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 should not carry out activities within 500 meters of the riverbank along the Besuk Kobokan due to the potential for being affected by expanding pyroclastic flows and lahar flows up to 17 kilometers from the peak.

Throughout 2026, MAGMA Indonesia has recorded 948 volcanic eruptions across Indonesia. Mount Semeru in East Java has the most eruptions with 495 events.

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