Mount Semeru Erupts Again This Morning, Ash Plume Around 800 Meters High

Mount Semeru in East Java erupted again on Tuesday (4/11/2025) at 07:14 AM WIB. In the last week, Mount Semeru has erupted 8 times.

Citing eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the ash plume was observed to be around 800 meters above the peak or 4,476 meters above sea level.

The ash plume was observed to be white to gray with thick intensity towards the north and northeast. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 170 seconds.

(Read: Floods Still the Most Frequent Disaster in Indonesia Until March 2025 )

According to MAGMA Indonesia's volcano activity report, Mount Semeru's activity level is at Level II (Alert). Seismicity observations on November 4, 2025, from 00:00-23:59 WIB showed 139 eruption tremors with amplitudes of 10-22 millimeters and durations of 50-182 seconds.

Subsequently, there were 22 avalanche tremors with amplitudes of 3-8 mm and durations of 39-104 seconds, and 8 exhalation tremors with amplitudes of 5-8 millimeters and durations of 45-63 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, the public should not engage in activities within 500 meters from the riverbanks 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 6,897 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions, with 2,763 events.

(Read: Bali Flood Victims, 9 People Died (Wednesday, September 10, 2025))