Mount Semeru Erupts Thursday Petang

Mount Semeru erupted again with an eruption as high as 800 meters above the peak on Thursday (5/6/2025) evening. (ANTARA/HO-PVMBG)

The officers of the Mount Semeru Observation Post noted that the eruption of Mount Semeru which was on the border of Lumajang and Malang Regencies, East Java was observed as high as 800 meters above the peak during the eruption on Thursday evening.

"There was an eruption of Mount Semeru at 17.43 WIB with an eruption column height of approximately 800 meters above the peak or 4,476 meters above sea level (masl)," said Mount Semeru Observation Post Officer Mukdas Sofian as reported by ANTARA, Thursday, June 5.

On Thursday, it was recorded that the highest mountain on the island of Java experienced four eruptions since 01.50 WIB with an eruption recorded on a seismograph with a maximum amplitude of 22 mm and a duration of 117 seconds.

Then the eruption returned at 06.08 WIB and the eruption was recorded on the seismograph with a maximum amplitude of 22 mm and a duration of 118 seconds, the third eruption occurred at 12.31 WIB with a maximum amplitude of 22 mm and a duration of 124 seconds.

The visual eruption of the three eruptions of Mount Semeru was not observed, only the fourth eruption was observed visually with an eruption as high as 800 meters above the peak.

The public is prohibited from carrying out any activities in the southeast sector along Besuk Kobokan as far as eight kilometers from the summit (the center of the eruption).

Then outside of that distance, people are not allowed to carry out activities at a distance of 500 meters from the riverbank (river border) 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 not allowed to move within a radius of three kilometers from the crater/peak of Mount Semeru, because they are prone to the dangers of throwing incandescent stones," he said.

In addition, the public needs to be aware of the potential for hot clouds, lava avalanches, and rain lava along rivers/valleys that 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 that are tributaries from Besuk Kobokan.