Alert! Mount Semeru Erupts Again Tonight (Saturday, March 21, 2026)

Mount Semeru in East Java erupted again on Saturday (March 21, 2026) at 18:27 WIB. In the past week, Mount Semeru has erupted 52 times.

Quoting eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the height of the ash column observed was around None meters above the peak or None meters above sea level.

No eruption visuals were observed. The eruption of Mount Semeru was still ongoing when this report was made.

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According to the MAGMA Indonesia volcanic activity report, the activity level of Mount Semeru is at Level III (Standby). Seismic observations on March 21, 2026 from 12:00 to 18:00 WIB showed 20 eruption/explosion earthquakes with an amplitude of 10 millimeters and a duration of 50 seconds.

Then, 1 blast earthquake with an amplitude of 4 millimeters and a duration of 74 seconds, as well as 2 harmonic earthquakes with an amplitude of 1 millimeter and a duration of 238-425 seconds.

PVMBG advises against any activities in the southeast sector along the Besuk Kobokan, within 13 kilometers of the peak (eruption center). Beyond 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 lava flows up to 17 kilometers from the peak.

During 2026, MAGMA Indonesia has recorded 1,112 volcanic eruptions/explosions across Indonesia. Mount Semeru in East Java had the most eruptions with 601 explosions.

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