Warning! Mount Semeru Erupts Again Tonight (Tuesday, January 6, 2026)

Mount Semeru in East Java erupted again on Tuesday (6/1/2026) at 18:28 WIB. In the last week, Mount Semeru has erupted 10 times.

Citing eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the height of the ash column was observed to be around 700 meters above the peak or 4,376 meters above sea level.

The ash column was observed to be white to gray with moderate intensity towards the north. Mount Semeru's eruption was still ongoing when this report was made.

(Read: Jakarta's Air Quality This Morning is the Third Worst in the World (Tuesday, June 6, 2023))

According to MAGMA Indonesia's volcanic activity report, Mount Semeru's activity level is at Level III (Alert). Seismic observations on January 6, 2026, at 12:00-18:00 WIB showed 32 eruption earthquakes with amplitudes of 10-23 millimeters and earthquake durations of 63-134 seconds.

Then, 1 rockfall earthquake with an amplitude of 2 mm and an earthquake duration of 48 seconds, and 7 exhalation earthquakes with amplitudes of 3-8 millimeters and earthquake durations of 51-60 seconds occurred.

PVMBG advises against any activities in the southeastern sector along Besuk Kobokan, as far as 13 kilometers from the peak (eruption center). Beyond this distance, people should not conduct activities within 500 meters from the river bank (river border) along Besuk Kobokan as there is a potential for expansion of hot clouds and lava flows up to 17 kilometers from the peak.

During 2026, MAGMA Indonesia has recorded 85 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions with 47 occurrences.

(Read: Indonesia, the Country with the Worst Air Quality in Southeast Asia)