Mount Semeru Erupts Again This Morning (Sunday, August 3, 2025)

Mount Semeru in East Java erupted again on Sunday (3/8/2025) at 08:04 AM Western Indonesian Time. In the last week, Mount Semeru has erupted 37 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 500 meters above the peak (4,176 meters above sea level).

The ash column was observed to be white to gray with thick intensity towards the south and southwest. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 128 seconds.

(Read: 4.7 M Earthquake Shakes Bonin Islands, Region)

According to MAGMA Indonesia's volcano activity report, Mount Semeru's activity level is at Level II (Alert). Seismic observations on August 3, 2025, from 00:00-23:59 Western Indonesian Time, showed 39 eruption earthquakes with amplitudes of 10-22 millimeters and durations of 61-241 seconds.

Additionally, there were 2 avalanche earthquakes with amplitudes of 6-7 mm and durations of 78-79 seconds, and 9 emission earthquakes with amplitudes of 3-8 millimeters and durations of 42-67 seconds.

PVMBG advises against any activity in the southeast sector along Besuk Kobokan, as far as 8 kilometers from the peak (eruption center). Beyond that distance, people should not conduct 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 5,440 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most with 2,182 occurrences.

(Read: Number of Earthquake Disaster Victims in Indonesia in 2020-2024)