Mount Semeru Erupts Again Tonight (Saturday, October 25, 2025)

Mount Semeru in East Java erupted again on Saturday (10/25/2025) at 22:03 WIB (Western Indonesian Time). In the last week, Mount Semeru has erupted 37 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 500 meters above the peak (4,176 meters above sea level).

The ash column was observed to be white to grey with thick intensity towards the southwest. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 174 seconds.

(Read: Volcanic Eruption Trends in Recent Years)

According to MAGMA Indonesia's volcanic activity report, Mount Semeru's activity level is at Level II (Alert). Seismicity observations on October 25, 2025, from 00:00-23:59 WIB showed 68 eruption earthquakes with amplitudes of 10-22 millimeters and durations of 71-169 seconds.

Additionally, there were 14 avalanche earthquakes with amplitudes of 2-4 mm and durations of 36-115 seconds, and 10 emission earthquakes with amplitudes of 2-7 millimeters and durations of 35-68 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 expansion of hot clouds and lava flows up to 13 kilometers from the peak.

Throughout 2025, MAGMA Indonesia has recorded 6,777 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most with 2,677 occurrences.

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