Mount Semeru Erupts Again Early This Morning, Eruption Height 800 Meters Above Peak

Mount Semeru in East Java erupted again on Friday (30/1/2026) at 04.44 WIB. In the last week, Mount Semeru has erupted 19 times.

Based on eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the height of the observed ash column was approximately 800 meters above the peak (4,476 meters above sea level).

The ash column was observed to be white to gray with thick intensity towards the northeast and east. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 154 seconds.

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

According to MAGMA Indonesia's volcanic activity report, Mount Semeru's activity level is at Level III (Alert). Seismic observations on January 30, 2026, from 18.00-23.59 WIB showed 31 eruption earthquakes with amplitudes of 15-22 millimeters and earthquake durations of 76-180 seconds.

In addition, there were 2 blast earthquakes with amplitudes of 2-4 millimeters and earthquake durations of 44-58 seconds, and 3 distant tectonic earthquakes with amplitudes of 4-5 millimeters, s-p of 16-43 seconds, and earthquake durations of 39-87 seconds.

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

During 2026, MAGMA Indonesia has recorded 391 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most, with 201 eruptions.

(Read: Indonesia Has the Most Active Volcanoes in the World)