Warning! Mount Semeru Erupts Again This Morning (Tuesday, November 18, 2025)

Mount Semeru in East Java erupted again on Tuesday (18/11/2025) at 06.11 AM WIB. In the last week, Mount Semeru has erupted 5 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 800 meters above the peak or 4,476 meters above sea level.

The ash column was observed to be white to grey with thick intensity towards the south. The eruption was recorded on a seismograph with a maximum amplitude of 22 millimeters and a duration of 112 seconds.

(Read: Earthquakes to Drought, These are the Natural Disasters that Frequently Occur in Indonesia until Mid-2023)

According to MAGMA Indonesia's volcanic activity report, Mount Semeru's activity level is at Level II (Alert). Seismic observations on November 18, 2025, from 00:00-23:59 WIB showed 146 eruption/explosion earthquakes with an amplitude of 10-22 millimeters and a duration of 68-176 seconds.

Furthermore, there were 40 avalanche earthquakes with an amplitude of 2-5 mm and a duration of 44-176 seconds, and 30 exhalation earthquakes with an amplitude of 2-8 millimeters and a duration of 32-107 seconds.

PVMBG advises against any activity in the southeast sector along Besuk Kobokan, as far as 8 kilometers from the peak (eruption center). Beyond that distance, people should not engage in activities within 500 meters of the riverbank (river boundary) 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 6,978 volcanic eruptions across Indonesia. Mount Semeru in East Java has erupted the most, with 2,799 occurrences.

(Read: 137 Natural Disaster Events Nearing End of January 2024, Floods Most Frequent)