Mount Semeru Erupts Again Wednesday Morning, Eruption Up to 1,000 Meters

SEAToday.com, Jakarta - Mount Semeru erupted again with the height of explosion reaching 1,000 meters above the peak on Wednesday (12/3) morning.

“There was an eruption of Mount Semeru on Wednesday, March 12, 2025 at 05.49 WIB with the column height of eruption observed around 1,000 meters above the peak or 4,676 meters above sea level (mdpl),” said Mount Semeru Observation Post Officer Ghufron Alwi, Wednesday (13/3), reported Antara.

The ash column was observed to be white to gray in color with thick intensity towards the northeast and east. The eruption was recorded on the seismograph with a maximum amplitude of 22 mm and a duration of 126 seconds.

Based on officer records, Mount Semeru has erupted five times on Wednesday since 00.41 WIB to 06.00 WIB with an explosion height of 500 meters to 1 kilometer above the peak.

However, the eruption activity of the mountain, which is located on the border of Lumajang and Malang regencies, East Java, did not impact and affect the activities of residents on the slopes of Mount Semeru.

This also makes people around the slopes can still do normal activities as usual.

There are a number of recommendations given by the Center for Volcanology and Geological Hazard Mitigation (PVMBG) related to the alert status of Mount Semeru.

The locals are prohibited from any activities in the southeast sector along Besuk Kobokan as far as eight kilometers from the peak (eruption center).

Beyond this distance, people should not carry out activities within 500 meters of the riverbank (river border) along Besuk Kobokan, because it has the potential to be hit by the expansion of hot clouds and lava flows up to a distance of 13 kilometers from the peak.

“The public should also not carry out activities within a three-kilometer radius of the crater/peak of Mount Semeru, because it is prone to the danger of incandescent rock ejection,” he said.

In addition, people also need to be aware of the potential for hot clouds, lava flows, and rain lava along the rivers/valleys that head up at the summit 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 of Besuk Kobokan.