Mount Semeru Erupts Again This Morning (Friday, September 26, 2025)

Mount Semeru in East Java erupted again on Friday (26/9/2025) at 06:33 AM WIB. In the last week, Mount Semeru has erupted 28 times.

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

Eruption visuals were not observed. The eruption of Mount Semeru was still ongoing when this report was made.

(Read: A 4.5 M Earthquake Shakes 14 Km North of San Carlos,)

According to MAGMA Indonesia's volcanic activity report, Mount Semeru's activity level is at Level II (Alert). Seismic observations on September 26, 2025, from 00:00-23:59 WIB showed 85 eruption/explosion earthquakes with amplitudes of 10-22 millimeters and earthquake durations of 51-192 seconds.

Furthermore, there were 12 exhalation earthquakes with amplitudes of 4-8 millimeters and earthquake durations of 43-80 seconds, and 5 harmonic tremors with amplitudes of 2-8 millimeters and earthquake durations of 43-80 seconds.

PVMBG urges people not to carry out any activities in the southeast sector along Besuk Kobokan, as far as 8 kilometers from the peak (eruption center). Beyond that distance, the public is advised not to conduct activities within 500 meters from the riverbanks (river boundaries) along Besuk Kobokan, as there is potential for expansion of hot clouds and lava flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 6,344 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most with 2,494 times.

(Read: 10 Countries with the Most Earthquakes in 2023, Indonesia Ranks First)