Mount Ili Lewotolok Erupts Again This Afternoon, Volcanic Ash Reaches 500 Meters Above Peak

Mount Ili Lewotolok in East Nusa Tenggara erupted again on Thursday (September 18, 2025) at 13:43 WITA. In the last week, Mount Ili Lewotolok has erupted 7 times.

Based on 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 500 meters above the peak or 1,923 meters above sea level.

The ash column was observed to be white to grey with thick intensity towards the west and northwest. The eruption was recorded on a seismograph with a maximum amplitude of 20.1 millimeters and a duration of 60 seconds.

(Read: 4.5 M Earthquake Shakes 14 Km North of San Carlos,)

According to MAGMA Indonesia''s volcano activity report, the activity level of Mount Ili Lewotolok is at Level III (Alert). Seismic observations on September 18, 2025, from 06:00-12:00 WITA, showed 60 eruption tremors with amplitudes of 14.6-30.2 millimeters and a tremor duration of 32-260 seconds.

Subsequently, 66 exhalation tremors with amplitudes of 2.6-10.4 millimeters and a tremor duration of 26-36 seconds, and 4 non-harmonic tremors with amplitudes of 3.8-8.8 millimeters and a tremor duration of 182-324 seconds occurred.

PVMBG urges the public around Mount Ili Lewotolok, as well as visitors/climbers/tourists, not to enter or conduct activities within a 3-kilometer radius from the center of Mount Ili Lewotolok''s activity, and to be aware of potential hazards from lava falls/landslides and pyroclastic flows from the South and Southeast, West, and Northeast sectors of Mount Ili Lewotolok.

Throughout 2025, MAGMA Indonesia has recorded 6,139 volcanic eruptions across Indonesia. Mount Semeru in East Java had the most eruptions (2,458 times), while Mount Ili Lewotolok erupted 275 times.

(Read: 5.1 M Earthquake Shakes 242 Km West of Kurio,)