Mount Semeru, which is located on the border of Lumajang and Malang regencies, East Java, has four eruptions with an eruption height of up to 1,000 meters above the peak on Tuesday, June 2 morning.
The first eruption occurred at 00.35 WIB with an eruptive column height of approximately 700 meters above the peak and a column of ash was observed to be white to gray with moderate intensity to the southwest.
"The Semeru Monument erupted again at 05.43 WIB with an eruptive column height of about 200 meters above the peak or 3,876 meters above sea level (masl) and a column of ash was observed to be white to gray with moderate intensity to the north," said the Mount Semeru Observation Post Officer, Liswanto, quoted by ANTARA.
A few minutes later, at 05.55 WIB, the highest mountain on the island of Java erupted again with an eruption column height observed about 1,000 meters above the peak or 4,676 meters above sea level.
"The ash column was observed to be white to gray with moderate intensity to the north. When the report was made, the eruption was still ongoing," he said.
The fourth eruption occurred at 07.41 WIB with an eruptive column height of about 500 meters above the peak (4,176 mdpl) and a column of ash was observed to be white to gray with thick intensity to the southwest.
"The eruption was recorded on a seismograph with a maximum amplitude of 22 mm and a duration of 115 seconds," he said.
The Center for Volcanology and Geological Hazard Mitigation (PVMBG) provides 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.
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"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 of Besuk Kobokan.
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