Monday Morning, Mount Semeru Erupted Again, Alert Status Still Valid

Illustration of the eruption of Mount Semeru (ANTARA)

LUMAJANGA - Mount Semeru, which is on the border of Lumajang and Malang Regencies, East Java, emitted white smoke as high as 500 meters to 1,000 meters from the summit on Monday, November 24.

"Visual observations of the volcano were clearly visible until it was covered in fog 0-II. Observation of white main crater smoke with moderate intensity, rising about 500-1000 meters from the summit," said Mount Semeru Observation Post Officer Mukdas Sofian reported by Antara, Monday morning.

The weather around the mountain has a height of 3,676 meters above sea level (masl) is cloudy to cloudy, the wind is weak to the east and the air temperature is around 21-22 degrees Celsius.

For the seismic activity of Mount Semeru for the last six hours on Monday at 00.00-06.00 WIB, 44 earthquakes were recorded with an amplitude of 10-22 mm, and an earthquake of 64-147 seconds.

"The Semeru Monument also experienced one gust earthquake with an amplitude of 8 mm, and an earthquake of 52 seconds, then three distant tectonic earthquakes with an amplitude of 3-30 mm, S-P 39 seconds and an earthquake length of 51-284 seconds," he said.

He explained that Mount Semeru has Level IV or Alert status, so that the Center for Volcanology and Geological Hazard Mitigation (PVMBG) provides a number of recommendations that people should not carry out any activities in the southeast sector along Besuk Kobokan as far as 20 kilometers from the summit.

Outside of that distance, he said, the public was also asked to stay away from the river border of at least 500 meters because the potential for hot clouds and lava could still occur.

"The public is also asked not to move within a radius of eight kilometers from the crater of Mount Semeru considering the potential danger of incandescent stones," he said.

In addition, vigilance needs to be increased against the potential for hot clouds of avalanches, lava flows, and lahars along rivers with the peak of Semeru, especially Besuk Kobokan, Besuk Bang, Besuk Kembar, Besuk Sat, and small rivers that are the subsidiaries.

Based on officers' records, Mount Semeru erupted again on Monday, November 24, 2025, at 03.04 WIB and the eruption visual was not observed, but the eruption was recorded on a seismograph with a maximum amplitude of 22 mm and a duration of 142 seconds.