Alert! Mount Semeru Erupts Again This Afternoon (Saturday, February 21, 2026)

Mount Semeru in East Java erupted again on Saturday (February 21, 2026) at 1:54 PM WIB. In the past week, Mount Semeru has erupted 56 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 None meters above the peak or None meters above sea level.

Eruption visuals were not observed. The eruption was recorded on the seismograph with a maximum amplitude of 22 millimeters and a duration of 107 seconds.

(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). Earthquake observations on February 21, 2026 from 6:00 AM to 12:00 PM WIB showed 20 eruption/explosion earthquakes with amplitudes of 10-22 millimeters and durations of 56-131 seconds.

Then, 2 emission earthquakes with amplitudes of 5-8 millimeters and durations of 44-51 seconds, as well as 1 local tectonic earthquake with an amplitude of 34 millimeters, s-p 7 seconds, and duration of 33 seconds.

PVMBG advises against any activities in the southeast sector along Besuk Kobokan, up to 13 kilometers from the peak (eruption center). Beyond that distance, residents should avoid activities within 500 meters of the riverbanks along Besuk Kobokan due to the potential for being affected by expanding hot clouds and lahar flows up to 17 kilometers from the peak.

In 2026, MAGMA Indonesia has recorded 707 volcanic eruptions across Indonesia. Mount Semeru in East Java has the most eruptions with 376 occurrences.

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