Warning! Mount Semeru Erupts Again Early This Morning (Sunday, February 1, 2026)

Mount Semeru in East Java erupted again on Sunday (February 1, 2026) at 04:55 AM Western Indonesian Time (WIB). In the last week, Mount Semeru has erupted 39 times.

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

The eruption was not visually observed. It was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 167 seconds.

(Read: Distribution of Fatalities Due to Floods and Landslides in West Sumatra (December 9, 2025))

According to MAGMA Indonesia's volcanic activity report, Mount Semeru's activity level is at Level III (Siaga/Alert). Seismic observations on February 1, 2026, from 06:00 PM to 11:59 PM WIB showed 21 eruption-related earthquakes with amplitudes of 11-22 millimeters and durations of 83-108 seconds.

Additionally, there was 1 rockfall earthquake with an amplitude of 5 mm and a duration of 48 seconds, and 2 gust earthquakes with amplitudes of 4-6 millimeters and durations of 42-44 seconds.

PVMBG advises against any activities in the southeast sector along Besuk Kobokan, as far as 13 kilometers from the peak (eruption center). Beyond that distance, the public should not engage in activities within 500 meters of the river banks (river boundaries) along Besuk Kobokan, as there is potential for expansion of hot clouds and lava flows up to 17 kilometers from the peak.

Throughout 2026, MAGMA Indonesia has recorded 418 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most, with 221 occurrences.

(Read: Distribution of Fatalities Due to Floods and Landslides in North Sumatra (December 9, 2025))