Mount Semeru, which is on the border of Lumajang and Malang Regencies, East Java, erupted again with an eruption height of 700 meters above the peak on Friday night.
"There was an eruption of Mount Semeru on Friday, October 31, 2025, at 20.25 WIB," said Mount Semeru Observation Post Officer Sigit Rian Alfian, as reported by ANTARA.
According to him, the height of the eruption column of the eruption of Mount Semeru was observed to be about 700 meters above the peak or 4,376 meters above sea level (masl).
"The ash column was observed to be white to gray with thick intensity to the west. The eruption was recorded on a seismograph with a maximum amplitude of 22 mm and a duration of 143 seconds," he said.
The highest mountain on the island of Java was recorded to have experienced an eruption 14 times on Friday with the first eruption occurring at 00.18 WIB, but the visual eruption was not observed because it was covered in fog.
He said Mount Semeru is still on Alert or Level II status, so the Center for Volcanology and Geological Hazard Mitigation (PVMBG) provides a number of recommendations, namely that people are prohibited from carrying out any activity in the southeast sector, along Besuk Kobokan as far as eight kilometers from the summit (the center of the eruption).
Outside of that distance, he said, people are not allowed to carry out activities at a distance of 500 meters from the riverbank along Besuk Kobokan, because it has the potential to be affected by the expansion of hot clouds and lava flows up to a distance of 13 kilometers from the summit.
"People are also advised not to move within a three-kilometer radius of the crater or peak of Mount Semeru, because it is prone to the dangers of incandescent stones," he said.
He appealed to the public to be aware of the potential for hot clouds, lava avalanches, and rain lava along rivers/valleys whose water flows originate at the top of Mount Semeru, especially along Besuk Kobokan, Besuk Bang, Besuk Kembar, and Besuk Sat, as well as the potential for lava in small rivers which are tributaries from Besuk Kobokan.
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