Semeru Enam Kali Erupsi dengan Tinggi Letusan hingga 1.000 Meter

Mount Semeru erupted with an eruption height of 1,000 meters above the peak on Thursday (11/6/2026). ANTARA/HO-PVMBG

LUMAJANG - Mount Semeru, which is on the border of Lumajang and Malang Regencies, East Java, has recorded six eruptions with an eruption height of up to 1,000 meters above the peak on Thursday from 00.41 to 11.13 WIB.

The first eruption occurred at 00.41 WIB with the height of the observed eruption column about 600 meters above the peak and the ash column was observed to be white to gray with medium intensity towards the southwest. When the report was made, the eruption was still ongoing.

"The eruption with the highest eruption occurred at 08.03 WIB with the height of the eruption column reaching 1,000 meters above the peak or 4,676 meters above sea level (msl)," said Mount Semeru Observation Post Officer Sigit Rian Alfian as reported by ANTARA, Thursday, June 11.

According to him, the observed ash column was white to gray with a thick intensity towards the southwest. The eruption was recorded on the seismograph with a maximum amplitude of 22 mm and a duration of 94 seconds.

Observations of the Mount Semeru earthquake on Thursday for the last six hours at 06.00 to 12.00 WIB recorded 18 times of eruption/erupting earthquakes, 1 time of subsidence earthquake with an amplitude of 3 mm, and 6 times of breath earthquakes with an amplitude of 5-7 mm.

"Mount Semeru also experienced 1 harmonic with an amplitude of 4 mm, and 3 distant tectonic earthquakes with an amplitude of 7-34 mm, S-P 13-67 seconds and earthquake duration of 36-115 seconds," he said.

Sigit 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 continued, 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 and the potential for lava on small rivers which are tributaries of Besuk Kobokan," he said.