Hot clouds of avalanche of Mount Merapi can be seen from Kaliurang, Sleman, DI Yogyakarta, Saturday (9/1/2021). BETWEEN PHOTOS / Hendra Nurdiyansyah
The volume of the lava dome of Merapi reached 158 thousand cubic meters.
Bali Tourism – The Center for Geological Disaster Research and Technology Development (BPPTKG) noted a decrease in the volume of Mount Merapi’s lava dome. This decrease was caused by avalanche activity and hot clouds that had occurred some time ago.
Head of BPPTKG Hanik Humaida, said based on BPPTKG records on January 25, 2021, the volume of the lava dome had reached 158 thousand cubic meters. However, on January 28, 2021, it decreased to 62 thousand cubic meters.
“So the deterioration of the lava dome occurred because part of it was ejected during the hot cloud yesterday,” Hanik told the media crew, Friday (29/1/2021).
Previously it was known that in the activity of Mount Merapi, the observation period on Wednesday (27/1/2021) at 00.00 WIB – 24.00 WIB then there were 52 times of hot cloud vomiting. The maximum distance of the incandescent lava was recorded as long as 3000 meters or 3 kilometers to the southwest or to be precise to Kali Boyong and Krasak.
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“So, during a series of events, this hot cloud of avalanches will also remove the existing materials. Because currently it is dominated by avalanches, the lava that comes out no longer has time to form a dome but immediately avoids,” he said.
Hanik also explained that currently observations for the morphology of the peak of Mount Merapi on the southwest side have indeed changed. However, the Southeast sector has not experienced any significant changes.
“The new lava dome in the crater has not been observed from Deles either,” he added.
Asked further regarding the current potential dangers related to the decreasing volume of the lava dome, Hanik said that if you look at it in general, the potential danger has also decreased. However, his party is still monitoring the existing developments regarding the supply which may arise at any time.
“Is the potential danger reduced? In general, yes, but what we need to pay attention to is if there is a supply from within, this is what we never know. But so far the potential is smaller,”
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Furthermore, the potential for hot clouds can also decrease. Although it cannot be predicted whether there will be a supply from within, Hanik said, there will be signs that will appear if this happens.
Hanik also cannot conclude that whether the activities of Mount Merapi have stopped or not. According to him, this development must still be waited for in the future, it cannot be concluded in just three days.
“We are still waiting and we have to be patient. But later of course the indicator will appear or be seen, whether it will be finished or will there be more supply from within,” he explained.
Hanik added, as of January 29, 2020 the probability distribution of the existing indicators, the effusive eruption was still at the top with a probability of 43 percent. Meanwhile, the explosive potential and the inner dome decreased significantly.
Through that conclusion, said Hanik, he added to paying attention to the current eruption that was heading to the southwest. So the current potential danger is in the form of lava avalanches and hot clouds.
The potential danger will focus on the Kali Kuning, Boyong, Bedog, Krasak, Bebeng and Putih sectors for a maximum of 5 kilometers. Meanwhile, the eruption of volcanic material in the event of an explosive eruption can reach a maximum of 3 kilometers from the summit.
In addition, mining activities in the rivers that head up at Mount Merapi in KRB III are also recommended to be suspended temporarily. Coupled with an appeal to tourism actors not to carry out tourism activities at KRB III Mount Merapi including climbing activities to the top in current conditions.
It should also be noted that until now, the BPPTKG is still setting the status of Mount Merapi on Alert (Level III).