JAKARTA - Mount Semeru, which has a height of 3,676 meters above sea level (msl), has erupted accompanied by an eruption as high as 1.2 kilometers above the peak.
"Mount Semeru erupted on Thursday, June 25, 2026 at 09.24 WIB with an observed eruption column height of about 1.2 km above the peak or 4,876 m above sea level," said Mount Semeru Observation Post Officer Liswanto, as quoted by ANTARA, Thursday, June 25.
According to him, the observed ash column was white to gray with medium intensity towards the south.
Based on the officers' records, the highest mountain on Java has been recorded as erupting five times since 05.44 WIB, which was the first eruption on Thursday with an observed eruption column height of about 700 meters above the peak.
The second eruption occurred at 06.36 WIB with the height of the observed eruption column about 900 meters above the peak, then at 06.51 WIB with the height of the observed eruption column about 600 meters above the peak, then the eruption again at 07.32 WIB with the height of the observed eruption column 700 meters above the peak, and the fifth eruption at 09.24 WIB.
He explained that currently the volcanic activity of Mount Semeru is at Level III Status (Alert) with the recommendation that the public not carry out any activities in the southeast sector along Besuk Kobokan as far as 13 kilometers from the peak (eruption center).
Outside this distance, the public is reminded not to carry out activities at a distance of 500 meters from the river bank (river border) along Besuk Kobokan, because they have the potential to be hit by the expansion of the hot cloud and lava flow up to a distance of 17 kilometers from the peak.
"The public is prohibited from carrying out activities within a radius of five kilometers from the crater/peak of Mount Semeru because they are prone to the danger of stone throwing (pijar)," he said.
He asked the public to be aware of the potential for hot clouds, lava discharge, and lahar along the river/valley streams upstream of the summit of Mount Semeru.
"Especially along Besuk Kobokan, Besuk Bang, Besuk Kembar, and Besuk Sat, as well as the potential for lahar in small rivers which are tributaries of Besuk Kobokan," said Liswanto.
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