Mount Semeru Erupts Again This Afternoon (Saturday, August 2, 2025)

Mount Semeru in East Java erupted again on Saturday (August 2, 2025) at 3:36 PM WIB. In the last week, Mount Semeru has erupted 33 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 was observed to be around 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 150 seconds.

(Read: 4.2 Magnitude Earthquake Shakes Fox Aleutian Islands)

According to the MAGMA Indonesia volcanic activity report, Mount Semeru's activity level is at Level II (Alert). Seismicity observations on August 2, 2025, from 00:00-23:59 WIB showed 51 eruption/explosion earthquakes with amplitudes of 10-22 millimeters and durations of 50-188 seconds.

Additionally, there were 4 rockfall earthquakes with amplitudes of 3-8 mm and durations of 32-135 seconds, and 11 gas emission earthquakes with amplitudes of 4-8 millimeters and durations of 22-87 seconds.

PVMBG advises against any activity in the southeast sector along Besuk Kobokan, as far as 8 kilometers from the peak (eruption center). Beyond this distance, people should not engage in activities within 500 meters from the riverbanks (river boundaries) along Besuk Kobokan, as there is a potential for hot clouds and lahar flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 5,428 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most with 2,178 times.

(Read: Indonesia Becomes the Country Most Frequently Hit by Earthquakes as of 2025)