Mount Semeru Re-Launched Hot Cloud Rain-Lahar Rain

The hot cloud ejection observed from Pronojiwo District on Wednesday (14/1/2026). ANTARA/HO-PVMBG

LUMAJANG - Mount Semeru, which is on the border of Lumajang and Malang Regencies, East Java, has again launched a hot cloud discharge (APG) and a rain lahar flood.

"Based on the observation of the earthquake at 12.00 WIB to 18.00 WIB, one hot cloud fall earthquake with an amplitude of 20 mm and an earthquake duration of 2.316 seconds was recorded," said Mount Semeru Observation Post Officer, Yadi Yuliandi, as reported by ANTARA, Wednesday, January 14.

The hot cloud stopped at 16.55 WIB and the distance of the slide was still within the safe limit and far from the residents of the Semeru slope.

Mount Semeru activity also experienced one flood-like earthquake with an amplitude of 25 mm, and a long earthquake of 3,705 seconds.

"In addition, 31 times of eruption/erupting earthquakes with an amplitude of 10-22 mm, and the earthquake lasted 54-177 seconds," he said.

In the same period, two aftershocks with an amplitude of 5-8 mm, one blow earthquake with an amplitude of 5 mm and one harmonic with an amplitude of 4 mm were recorded.

"Visual observations, the volcano is covered by fog 0-III. The crater smoke is not observed. The weather is cloudy to overcast, the wind is weak towards the southeast," he said.

Mount Semeru is still in the Alert status or Level 3, so the Center for Volcanology and Geological Hazard Mitigation (PVMBG) recommends that people do not carry out any activities in the southeast sector, along the Besuk Kobokan as far as 13 km from the peak (center of the eruption).

"Outside this distance, 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 km from the peak," he said.

The public is reminded not to carry 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).

The public must also be aware of the potential for hot clouds, lava ejection, and lahar along the river/valley flows upstream of the Semeru Volcano peak, 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.