LUMAJANG Mount Semeru, with a height of 3,676 meters above sea level (masl), again showed significant volcanic activity on Monday morning, with several eruptions producing eruptions up to 700 meters above the peak.
The first eruption occurred at 00.23 WIB, although the visual eruption was not observed, it was recorded on a seismograph with a maximum amplitude of 22 mm and a duration of 125 seconds. The next eruption occurred at 01.04 WIB, with the eruptive column being observed about 700 meters above the peak.
The column of volcanic ash is white to gray, with thick intensity leading to the southeast and south. This eruption was recorded with a maximum amplitude of 22 mm and a duration of 127 seconds.
At 03.36 WIB, another eruption was not observed visually, but was recorded on a seismograph with a maximum amplitude of 22 mm and a duration of 164 seconds. The next eruption occurred at 07.42 WIB, with the ash column being observed as high as 700 meters above the peak, or 4,376 mdpl.
This ash column is white to gray, north and northeast, and recorded on a seismograph with a maximum amplitude of 21 mm and a duration of 117 seconds.
The last eruption was recorded at 09.49 WIB, which was also not visually visible, but was recorded on a seismograph with a maximum amplitude of 22 mm and a duration of 134 seconds.
Mount Semeru Observation Post officer Sigit Rian Alfian reminded that the status of Mount Semeru is still alert. The Center for Volcanology and Geological Hazard Mitigation (PVMBG) issued a number of recommendations for public safety.
Among them, the community is prohibited from carrying out activities in the southeast sector along Besuk Kobokan as far as eight kilometers from the summit. In addition, activities along the banks of the Besuk Kobokan river are also limited to 500 meters from the river border due to the potential danger of hot clouds and lava flows up to 13 kilometers from the summit.
"People are also asked not to move within a 3-kilometer radius of the crater or peak of Mount Semeru, because it is at risk of being exposed to the dangers of incandescent stones," said Sigit.
In addition, he also reminded the potential for hot clouds, lava avalanches, and rain lava along rivers that originate at the peak of Mount Semeru, especially in Besuk Kobokan, Besuk Bang, Besuk Kembar, and Besuk Sat, as well as in small rivers that are tributaries from Besuk Kobokan.
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