JAKARTA - Mount Semeru, which is on the border of Lumajang and Malang Regencies, East Java, erupted again with volcanic ash heading southwest on Saturday, April 18 morning.
"Mount Semeru erupted on Saturday at 05.26 WIB with a white to gray ash column with medium intensity towards the southwest," said Mount Semeru Observation Post Officer, Liswanto in a written report, quoted by Antara.
According to him, the height of the eruption column of Mount Semeru was observed at around 700 meters above the peak or a height of 4,376 meters above sea level (msl) and when the report was made, the eruption was still ongoing.
Based on data from officers, the highest mountain on Java experienced six eruptions on Saturday for the last six hours since 00.00 WIB to 06.00 WIB with eruption heights ranging from 300 meters to 700 meters above the peak.
For the observation of earthquakes in the same period, 11 times of eruption/eruption earthquakes with an amplitude of 11-22 mm, and the earthquake duration of 94-152 seconds, then one eruption earthquake with an amplitude of 6 mm and the earthquake duration of 32 seconds, and one harmonic with an amplitude of 7 mm and the earthquake duration of 214 seconds.
Liswanto explained that Mount Semeru is in the Level III (Alert) volcanic activity status, so the Center for Volcanology and Geological Hazard Mitigation (PVMBG) has provided a number of recommendations, namely that the public should not carry out any activities in the southeast sector along Besuk Kobokan, as far as 13 kilometers from the peak (center of the eruption).
Outside this distance, he said, people do not carry out activities at a distance of 500 meters from the river bank (river border) along Besuk Kobokan because they have the potential to be hit by the expansion of the hot cloud and lava flow up to a distance of 17 km from the peak.
"The public is prohibited from carrying out activities within a radius of 5 km from the crater/peak of Mount Semeru because they are prone to the danger of stone throwing (pijar)," he said.
He also appealed to the public to be aware of the potential for hot clouds, lava discharge, and lahar along the river/valley flows upstream of the Semeru Volcano peak, especially along Besuk Kobokan, Besuk Bang, Besuk Kembar, and Besuk Sat, as well as the potential for lahar in small rivers which are tributaries of Besuk Kobokan.
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