Mount Semeru, which is on the border of Lumajang and Malang Regencies, East Java, erupted again with an eruption as high as 900 meters above the peak on Monday, December 1.
"There was an eruption of Mount Semeru at 06.08 WIB with an eruption column height of about 900 meters above the peak or 4,576 meters above sea level," said Mount Semeru Observation Post Officer Sigit Rian Alfian, quoted by Antara, Monday morning.
According to him, the ash column was observed to be white to gray with thick intensity to the southwest and the eruption was recorded on a seismograph with a maximum amplitude of 22 mm and a duration of 116 seconds.
Based on officers' records, Mount Semeru had three eruptions on Monday morning, namely at 05.09 WIB with an eruptive column height of about 500 meters above the peak, then at 05.58 WIB with an eruption column height of 700 meters above the peak, and at 06.08 WIB with an eruption height of 900 meters above the peak.
He explained that the highest mountain on the island of Java has a Alert status or Level III, so that the Geological Agency of the Center for Volcanology and Geological Hazard Mitigation (PVMBG) provides a number of recommendations, namely that people are not allowed to carry out any activities in the southeast sector along Besuk Kobokan, as far as 13 km from the summit (the center of the eruption).
"Outside of that distance, people do not 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 17 km from the summit," he said.
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In addition, people are prohibited from doing activities within a 5 km radius of the crater/peak of Mount Semeru because they are prone to the danger of throwing stones (lightning).
The public is also asked to be aware of the potential for hot clouds, lava avalanches, and lahars along rivers/valleys that originate at the peak of the Semeru Volcano, especially along Besuk Kobokan, Besuk Bang, Besuk Kembar, and Besuk Sat as well as the potential for lahars in small rivers which are tributaries of Besuk Kobokan.
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