The LuMAJANG - Mount Semeru was recorded as having erupted four times with an eruption of up to 800 meters above the peak on Saturday morning.
The first eruption of the mountain on the border of Lumajang and Malang Regencies, East Java, occurred at 00.38 WIB with an eruption column height observed about 700 meters above the peak and a column of ash was observed to be white to gray with moderate to western intensity.
"The Semeru Monument erupted again at 05.53 WIB 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 Ghufron Alwi, as reported by ANTARA, Saturday, May 24.
According to him, the ash column was observed to be white to gray with moderate intensity to the northeast and when the report was made, the eruption was still ongoing.
Then at 07.29 WIB, Mount Semeru erupted again with an eruption column height of about 400 meters above the peak and the ash column was observed to be white to gray with thick intensity to the southeast and south.
"The eruption was recorded on a seismograph with a maximum amplitude of 22 mm and a duration of 114 seconds," he said.
The highest mountain on the island of Java erupted again at 08.50 WIB with an eruption column height of about 600 meters above the peak or 4,276 meters above sea level.
"The ash column was observed to be white to gray with thick intensity to the south. The eruption was recorded on a seismograph with a maximum amplitude of 22 mm and a duration of 126 seconds," he said.
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He explained that the Center for Volcanology and Geological Hazard Mitigation (PVMBG) provided a number of recommendations related to the status of Mount Semeru which is still Alert or Level II, 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).
Outside of that distance, he said, people are not allowed to carry out activities at a distance of 500 meters from the riverbank 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.
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