Warning! Mount Semeru Erupts Again Early This Morning (Friday, January 23, 2026)

Mount Semeru in East Java erupted again on Friday (1/23/2026) at 04:33 AM WIB. In the last week, Mount Semeru has erupted 20 times.

Citing 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.

Visual eruptions were not observed. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and and a duration of 115 seconds.

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

According to the MAGMA Indonesia volcano activity report, the activity level of Mount Semeru is at Level III (Alert). Seismic observations on January 23, 2026, from 18:00-23:59 WIB showed 32 eruption earthquakes with amplitudes of 11-22 millimeters and durations of 64-129 seconds.

Then, 1 rockfall earthquake with an amplitude of 5 mm and a duration of 69 seconds, and 1 exhalation earthquake with an amplitude of 7 millimeters and a duration of 29 seconds occurred.

PVMBG advises against any activity in the southeast 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 from 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.

Throughout 2026, MAGMA Indonesia has recorded 306 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most, with 166 eruptions.

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