Mount Semeru Erupts Again This Afternoon (Sunday, September 28, 2025)

Mount Semeru in East Java erupted again on Sunday (28/9/2025) at 11:11 AM WIB. In the last week, Mount Semeru has erupted 54 times.

Based on 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 (None meters above sea level).

Visual eruption was not observed. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 132 seconds.

(Read: Distribution of Jakarta Flood Points (July 8, 2025 at 07:00 AM WIB))

According to MAGMA Indonesia's volcano activity report, Mount Semeru's activity level is at Level II (Alert). Seismic observations on September 28, 2025, from 00:00-23:59 WIB showed 70 eruption earthquakes with amplitudes of 11-22 millimeters and earthquake durations of 45-186 seconds.

Followed by 17 emission earthquakes with amplitudes of 3-8 millimeters and earthquake durations of 29-70 seconds, and 1 harmonic earthquake with an amplitude of 14 millimeters and an earthquake duration of 54 seconds.

PVMBG urges against 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 borders) along Besuk Kobokan due to the potential for expansion of hot clouds and lava flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 6,412 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions with 2,520 times.

(Read: Highest Flood Risk Index in Bekasi within Jabodetabek)