Mount Semeru on the border of Lumajang and Malang Regencies, East Java, which has a height of 3,676 meters above sea level (msl) has experienced four eruptions with an eruption height of up to 1 kilometer above the peak on Wednesday.
The first eruption occurred at 00.52 WIB with the height of the observed eruption column about 700 meters above the peak and the ash column was observed to be white to gray in intensity to the northeast, recorded on the seismograph with a maximum amplitude of 22 mm and a duration of 115 seconds.
"The second eruption occurred at 08.14 WIB with the height of the observed eruption column about 800 meters above the peak," said Mount Semeru Observation Post Officer, Sigit Rian Alfian in a written report reported by ANTARA, Wednesday, July 1.
According to him, the observed ash column was white to gray with a thick intensity towards the east and southeast. The eruption was recorded on the seismograph with a maximum amplitude of 14 mm and a duration of 89 seconds.
Then the eruption occurred again at 09.24 WIB with the height of the observed eruption column about 1 km above the peak and the ash column was observed to be white to gray with a thick intensity towards the east and southeast. The eruption was recorded on the seismograph with a maximum amplitude of 22 mm and a duration of 103 seconds.
"A few minutes later, the highest mountain on Java erupted again at 10.10 WIB with an observed eruption column height of about 1 km above the peak or 4,676 m above sea level," he said.
The observed ash column was white to gray with a thick intensity towards the southeast and south. The eruption was recorded on the seismograph with a maximum amplitude of 22 mm and a duration of 112 seconds.
Meanwhile, the Head of the Lumajang Regional Disaster Management Agency (BPBD) Isnugroho said his party had not received reports of the impact of the spread of volcanic ash due to the eruption of Mount Semeru.
"We urge the public to comply with all recommendations that have been set for the safe distance of Mount Semeru," he said.
He explained that the volcanic activity of Mount Semeru was at Level III Status (Alert) with the recommendation that the public 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, the public does 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 kilometers from the peak.
"The public is prohibited from carrying out activities within a radius of five kilometers from the crater/peak of Mount Semeru, because they are prone to the danger of stone throwing (pijar)," he said.
He asked the public to be aware of the potential for hot clouds, lava discharge, and lahar along the river/valley streams upstream of the summit of Mount Semeru.
"Especially along Besuk Kobokan, Besuk Bang, Besuk Kembar, and Besuk Sat, as well as the potential for lava on small rivers which are tributaries of Besuk Kobokan," said Isnugroho.
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