Mount Semeru Erupts Twice, Abu Capai 1 Kilometer Colon

LUMAJANG Mount Semeru, which has a height of 3,676 meters above sea level (masl), erupted again on Tuesday, May 13. The eruption occurred twice in the morning and in the morning, with the highest eruption reaching 1,000 meters above the peak or Mahameru.

Mount Semeru Observation Post officer, Yadi Yuliandi, said that the first eruption occurred at 00.23 WIB with an eruption column as high as 600 meters from the summit, while the second eruption was recorded at 04.54 WIB with an eruptive column reaching 1 kilometer.

"There was an eruption of Mount Semeru on Tuesday, May 13, 2025, at 04:54 WIB, with an eruption column height of approximately 1,000 meters above the peak," he said as quoted by ANTARA.

The ash column is observed to be gray with moderate to thick intensity, leading west. The eruption was recorded on a seismograph with a maximum amplitude of 22 mm and a duration of 165 seconds.

Previously, at 00.23 WIB, the first eruption also noted that the thick gray ash column was heading west with the same seismic amplitude, but the duration was shorter, which was 150 seconds.

The mountain, which is located on the border of Lumajang and Malang Regencies, is still on Alert (Level II) status. The Center for Volcanology and Geological Hazard Mitigation (PVMBG) issued a number of recommendations to the public.

PVMBG prohibits all forms of activity in the southeast sector of Mount Semeru, especially along Besuk Kobokan as far as 8 kilometers from the summit.

Beyond that radius, people are also prohibited from doing activities within 500 meters of the riverbank because of the potential for hot clouds and lava flows that can spread up to 13 kilometers from the eruption center.

In addition, the public is advised not to carry out activities within a radius of 3 kilometers from the crater/peak due to the potential for harmful incandescent stones.

The public is also asked to be aware of the potential for hot clouds, lava avalanches, and rain lava along rivers that originate at the peak of Mount Semeru, including Besuk Kobokan, Besuk Bang, Besuk Kembar, and Besuk Sat, as well as its tributaries.