Mount Ili Lewotolok Erupted on Wednesday Night, Activity Level at Alert

Mount Ili Lewotolok in East Nusa Tenggara erupted again on Wednesday (September 17, 2025) at 00:33 WITA. In the last week, Mount Ili Lewotolok has erupted 6 times.

Citing 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 600 meters above the peak or 2,023 meters above sea level.

The ash column was observed to be gray with thick intensity towards the west. The eruption was recorded on a seismograph with a maximum amplitude of 21 millimeters and a duration of 61 seconds.

(Read: Floods and Earthquakes, Disaster Risks in the IKN Core Area)

According to the MAGMA Indonesia volcano activity report, the activity level of Mount Ili Lewotolok is at Level III (Alert). Seismicity observations on September 17, 2025, from 18:00-23:59 WITA showed 60 eruption tremors/earthquakes with amplitudes of 5.1-24.2 millimeters and tremor durations of 37-58 seconds.

Furthermore, there were 52 exhalation tremors with amplitudes of 1.9-10.8 millimeters and tremor durations of 28-60 seconds, and 1 harmonic tremor with an amplitude of 1.4 millimeters and a tremor duration of 209 seconds.

PVMBG urges the public around Mount Ili Lewotolok as well as visitors/climbers/tourists not to enter and not to carry out activities within a 3-kilometer radius from the center of Mount Ili Lewotolok''s activity, to be aware of the potential hazards from falling/landslides of lava and pyroclastic flows from the Southern and Southeastern sectors, the Western sector, and the Northeastern sector of Mount Ili Lewotolok.

Throughout 2025, MAGMA Indonesia has recorded 6,125 volcanic eruptions across Indonesia. Mount Semeru in East Java erupted the most (2,454 times), while Mount Ili Lewotolok erupted 274 times.

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