Mount Ili Lewotolok Erupts on Friday Afternoon, Status on Alert

Mount Ili Lewotolok in East Nusa Tenggara erupted again on Friday (12/9/2025) at 15:37 WITA. In the last week, Mount Ili Lewotolok has erupted 7 times.

Citing eruption information from the Center for Volcanology and Geological Hazard Mitigation (PVMBG) via the MAGMA Indonesia application, the height of the observed ash column reached 600 meters above the peak (2,023 meters above sea level).

The ash column was observed to be white to grey with thick intensity towards the west. The eruption was recorded on a seismograph with a maximum amplitude of 5.1 millimeters and a duration of 33 seconds.

(Read: Hit by Floods and Landslides, Here is the Population of Cianjur 2024)

According to MAGMA Indonesia''s volcano activity report, the activity level of Mount Ili Lewotolok is at Level III (Alert). Seismic observations on September 12, 2025, from 06:00-12:00 WITA showed 33 eruption tremors/earthquakes with amplitudes of 2.8-16.7 millimeters and a duration of 30-60 seconds.

Subsequently, there were 43 exhalation tremors with amplitudes of 3.6-4.7 millimeters and a duration of 27-41 seconds, and 2 deep volcanic earthquakes with amplitudes of 1.7-20.1 millimeters, s-p 0.7-1 seconds, and a duration of 14-16 seconds.

PVMBG urges the public around Mount Ili Lewotolok as well as visitors/hikers/tourists not to enter and not to carry out activities within a 3-kilometer radius from the center of Mount Ili Lewotolok''s activity, and to be aware of the potential danger from rockfalls/lava avalanches and hot clouds from the South and Southeast sectors, the West sector, and the Northeast sector of Mount Ili Lewotolok.

Throughout 2025, MAGMA Indonesia has recorded 6,065 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions (2,433 times) while Mount Ili Lewotolok erupted 264 times.

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