Mount Semeru Eruption Tuesday Afternoon, Eruption as High as 900 Meters

Mount Semeru erupted with an eruption height of 900 meters above the peak on Tuesday (30/6/2026) afternoon. ANTARA/HO-PVMBG

LUMAJANG - Mount Semeru on the border of Lumajang and Malang Regencies, East Java, erupted with an eruption as high as 900 meters above the peak on Tuesday afternoon.

"There was an eruption of Mount Semeru at 13.04 WIB with an observed eruption column height of about 900 meters above the peak or 4,576 meters above sea level (msl)," said Mount Semeru Observation Post Officer, Sigit Rian Alfian in a written report reported by ANTARA, Tuesday, June 30.

According to him, the column of volcanic ash of Semeru was observed to be white to gray with thick intensity towards the northeast and east.

"The eruption of Semeru was recorded on the seismograph with a maximum amplitude of 21 mm and a duration of 99 seconds," he said.

Based on the officers' records, the highest mountain on Java experienced five eruptions on Tuesday since 00.16 WIB until 13.04 WIB with an eruption height of 500 meters to 900 meters above the peak.

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.