Mount Semeru Erupts Again Tonight (Sunday, September 7, 2025)

Mount Semeru in East Java erupted again on Sunday (7/9/2025) at 20:30 WIB. In the last week, Mount Semeru has erupted 34 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 was observed to reach None meters above the peak (None meters above sea level).

The visual eruption was not observed. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 144 seconds.

(Read: Trends in Volcanic Eruptions in Recent Years)

According to MAGMA Indonesia''s volcanic activity report, Mount Semeru''s activity level is at Level II (Alert). Seismicity observations on September 7, 2025, from 00:00-23:59 WIB showed 48 eruption earthquakes with amplitudes of 10-22 millimeters and earthquake durations of 65-197 seconds.

Then, 5 times of exhalation earthquakes with amplitudes of 4-8 millimeters and earthquake durations of 43-75 seconds, as well as 5 times of distant tectonic earthquakes with amplitudes of 4-12 millimeters s-p 13-24 seconds and earthquake durations of 42-98 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 should not engage in activities within 500 meters from the riverbanks (river borders) along Besuk Kobokan due to the potential for being affected by the expansion of hot clouds and lava flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 5,998 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most with 2,402 times.

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