Mount Semeru Erupts Again with an Eruption Height of 600 Meters Above the Peak

LUMAJANG - Mount Semeru, which is on the border of Lumajang and Malang Regencies, East Java, erupted with an eruption height of 600 meters above the peak on Wednesday morning.

"Mount Semeru erupted on Wednesday, June 24, 2026, at 06.22 WIB with an observed eruption column height of about 600 meters above the peak or 4,276 meters above sea level (msl)," said Mount Semeru Observation Post Officer, Yadi Yuliandid in a written report in Lumajang, Wednesday.

According to him, the eruption of Semeru was also accompanied by a column of ash observed in gray with a thick intensity towards the west. The eruption was recorded on the seismograph with a maximum amplitude of 22 mm and a duration of 130 seconds.

Based on observations on Wednesday at 00.00 WIB to 06.00 WIB, it was recorded that the seismic activity of Mount Semeru experienced 14 times of eruption/erupting earthquakes with an amplitude of 15-22 mm, three times of falling earthquakes with an amplitude of 2-4 mm, two times of eruption earthquakes with an amplitude of 3-4 mm, one time harmonic with an amplitude of 1 mm, and one time distant tectonic earthquake with an amplitude of 15 mm.

Yadi 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, he said, the public does not 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 lava on small rivers which are tributaries of Besuk Kobokan," he said.