Mount Semeru Erupts Again Tonight (Saturday, January 17, 2026)

Mount Semeru in East Java erupted again on Saturday (17/1/2026) at 23:55 WIB. In the last week, Mount Semeru has erupted 46 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 reached None meters above the peak (None meters above sea level).

No visual eruption was observed. The eruption of Mount Semeru was still ongoing when this report was made.

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According to MAGMA Indonesia's volcano activity report, Mount Semeru's activity level is at Level III (Alert). Seismic observations on January 17, 2026, at 12:00-18:00 WIB showed 26 eruption earthquakes with amplitudes of 10-22 millimeters and earthquake durations of 68-142 seconds.

Then, 3 times of rockfall earthquakes with amplitudes of 2-3 mm and earthquake durations of 37-50 seconds, and 1 time of an emission earthquake with an amplitude of 5 millimeters and an earthquake duration of 46 seconds occurred.

PVMBG urges against any activity 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 from the riverbank (river border) along Besuk Kobokan due to the potential for expansion of hot clouds and lava flows up to 17 kilometers from the peak.

Throughout 2026, MAGMA Indonesia has recorded 245 volcano eruptions across Indonesia. Mount Semeru in East Java had the most eruptions with 135 times.

(Read: There were 1,300 Natural Disasters in Indonesia until September 2024, Here are the Details)