5 Times Erupt! Semeru Is Still Active This Morning

Mount Semeru erupted with an eruption as high as 700 meters above the peak on Thursday (10/4/2025) at 06.40 WIB. (ANTARA)

Mount Semeru, which is on the border of Lumajang and Malang Regencies, East Java, experienced five eruptions with an eruption height of 400 meters to 800 meters on Thursday, April 10 morning.

The first eruption occurred at 00.18 WIB with an eruptive column height of about 500 meters above the peak, and the ash column was observed to be white to gray with moderate intensity to the southwest. When the report was made, the eruption was still ongoing.

"Then at 00.42 WIB, Mount Semeru erupted again with an eruption column height of about 800 meters above the peak or 4,476 meters above sea level (masl)," said Mount Semeru Observation Post Officer, Liswanto, quoted by ANTARA, Thursday, April 10.

During the eruption, the ash column was observed to be white to gray with moderate intensity to the southwest and when the report was made, the eruption was still ongoing.

The highest mountain on the island of Java erupted again at 05.15 WIB with an eruption column height observed about 400 meters above the peak and a column of ash was observed to be white to gray with moderate to southwest intensity. When the report was made, the eruption was still ongoing.

The fourth eruption occurred at 05.45 WIB with an eruptive column height of about 400 meters above the peak and a column of ash was observed to be white to gray with moderate intensity to the southwest.

Mount Semeru erupted again at 06.40 WIB with an eruption column height of about 700 meters above the peak or 4,376 meters above sea level.

"The ash column was observed to be white to gray with thick intensity to the southwest and west. The eruption was recorded on a seismograph with a maximum amplitude of 22 mm and a duration of 150 seconds," he said.

He explained that Mount Semeru is still Level II or alert, so the Center for Volcanology and Geological Hazard Mitigation (PVMBG) provides a number of recommendations, namely that people are prohibited from carrying out any activities in the southeast sector along Besuk Kobokan as far as eight kilometers from the summit (the center of the eruption).

Then outside of that distance, people are not allowed to carry out activities at a distance of 500 meters from the riverbank (river border) along Besuk Kobokan, because it has the potential to be affected by the expansion of hot clouds and lava flows up to a distance of 13 kilometers from the summit.

"People are also not allowed to move within a radius of three kilometers from the crater/peak of Mount Semeru, because they are prone to the dangers of throwing incandescent stones," he said.

The public also needs to be aware of the potential for hot clouds, lava avalanches, and rain lava along rivers and valleys that originate at the peak 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 from Besuk Kobokan.