LUMAJANG - Mount Semeru, which has a height of 3,676 meters above sea level (masl) in Lumajang Regency, East Java, has again launched hot clouds of avalanches as far as 3 kilometers.
"Based on visual observations during the Sunday period at 00.00-06.00 WIB from the Mount Semeru Observation Post on Mount Sawur, hot clouds of avalanches were observed with a sliding distance of 3 kilometers towards Besuk Kobokan," said Head of the West Region Volcano Mitigation Sub Division of PVMBG Nia Khaerani quoted by Antara, Sunday, December 19.
Visually, hot clouds of avalanches were also observed with a sliding distance of 3,000 meters to the southeast and a silent fire was observed, as well as fire rays when visually the mountain was clearly visible.
"For seismic activity, hot cloud avalanches once with an amplitude of 20 mm for 720 seconds, then eight avalanches with an amplitude of 2-8 mm for 30-60 seconds," he said.
Mount Semeru also experienced one gust earthquake with an amplitude of 7 mm for 65 seconds and one distant tectonic earthquake with an amplitude of 7 mm for 120 seconds.
"The hot clouds that fall from Mount Semeru come from two sources, namely the top (the growth of the lava dome) and from the bottom (the tip of the lava tongue)," he said.
Meanwhile, the activity of Mount Semeru during the observation period on Sunday at 06.00-12.00 WIB was visually monitored, the highest mountain on the island of Java was clearly visible and occurred in one avalanche with a sliding distance of 200 meters in the direction of the Kobokan Bulk.
For seismic activity, avalanches occurred seven times with an amplitude of 7-22 mm for 42-125 seconds and one shallow volcanic earthquake with an amplitude of 10 mm for 13 seconds.
"The status of Mount Semeru is at level III or alert, so people are advised not to carry out any activities in the southeast sector along Besuk Kobokan as far as 13 kilometers from the summit (the center of the eruption)," he said.
Beyond that distance, he continued, the public should not carry out activities within 500 meters of the riverbank (river border) along Besuk Kobokan because of the potential for expansion of hot clouds and lava flows to a distance of 17 km from the summit.
"People are also prohibited from doing activities within a 5 km radius from the crater/peak of Mount Semeru because it is prone to the danger of throwing stones (incandescent)," he said.
The public must also be aware of the potential for hot cloud avalanches (APG), lava avalanches, and lahars along rivers/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 lahars in rivers and streams. a small river which is a tributary of Besuk Kobokan.
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