Mount Semeru, which is on the border of Lumajang and Malang Regencies, East Java, erupted again with an eruption as high as 800 meters above the peak on Monday morning.
"There was an eruption of Mount Semeru at 07.52 WIB. The height of the eruption column was observed to be about 800 meters above the peak or 4,476 meters above sea level (masl)," said Mount Semeru Observation Post Officer Mukdas Sofian in quoted by ANTARA, Monday 4 August.
According to him, the ash column 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 181 seconds.
Previously, at 05.56 WIB, the highest mountain on the island of Java erupted with an eruption column height of about 500 meters above the peak or 4,176 meters above the peak.
The ash column was observed to be white to gray with moderate intensity to the southwest. When the report was made, the eruption was still ongoing.
The activity of Mount Semeru on Sunday (3/8) for 24 hours was recorded as many as 46 eruption/eruption earthquakes, five gusts, three harmonics, two deep volcanic earthquakes, and three distant tectonic earthquakes.
Mukdas explained that Mount Semeru is still on Alert or Level II status, so that the Center for Volcanology and Geological Hazard Mitigation (PVMBG) provides a number of recommendations, namely that people are prohibited from carrying out any activity in the southeast sector, and 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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"The public is also advised not to move within a three-kilometer radius of the crater/peak of Mount Semeru, because it is prone to the dangers of incandescent stones," he said.
He appealed to the public to be aware of the potential for hot clouds, lava avalanches, and rain lava along rivers/valleys whose water flows originate at the top of Mount Semeru, especially along Besuk Kobokan, Besuk Bang, Besuk Kembar, and Besuk Sat, as well as the potential for lava in small rivers which are tributaries from Besuk Kobokan.
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