Head of the Geological Disaster Technology Research and Development Center (BPPTKG) Hanik Humaida, said Mount Merapi on the border of the Special Region of Yogyakarta and Central Java, released four hot clouds of avalanches on Thursday (12/8/2021).
In a written statement, Thursday (12/8/2021), Hanik said the hot cloud had the furthest sliding distance of up to 3,000 meters (3 km) to the southwest. Hanik said Mount Merapi launched the first hot cloud of avalanches at 01:07 West Indonesia Time (WIB).
The hot avalanche cloud, recorded on a seismogram, has an amplitude of 67 mm and lasts 157 seconds. “The glide distance is 2,500 meters to the southwest,” said Hanik.
The mountain again launched hot clouds of avalanches to the southwest as far as 1,800 meters at 01.16 WIB. According to BPPTKG, the hot avalanche cloud had an amplitude of 43 mm and lasted for 111 seconds.
At 01:53 WIB, the third hot cloud rolled 3,000 meters to the southwest with an amplitude of 57 mm and a duration of 232 seconds.
Furthermore, the fourth hot cloud was observed to glide as far as 1,800 meters at 02.46 WIB with an amplitude of 19 mm and a duration of 110 seconds. During the observation period on Thursday (12/8/2021) at 00.00 to 06.00 WIB, BPPTKG recorded 12 incandescent lava avalanches with a sliding distance of 500 to 1,800 meters out of Mount Merapi to the southwest.
BPPTKG still maintains the status of Mount Merapi’s activity at Level III or Standby. The lava flows and hot clouds of Mount Merapi are expected to affect the area in the south-southwest sector which includes the Yellow River, Boyong, Bedog, Krasak, Bebeng, and Putih.
If the volcano erupts, the ejection of volcanic material can reach an area within a radius of three kilometers from the top of the mountain.
Previously, Mount Merapi launched hot clouds of avalanches as far as 3,000 meters to the southwest on Tuesday (10/8/2021).