TIME.CO, Yogyakarta – Center for Research and Development of Geological Disaster Technology (BPTKG) relationships Mount Merapi avalanches have occurred on the border between Central Java and the special region of Yogyakarta lava 144 times during the observation from August 18 to 24, 2023.
BPPTKG chief Agus Budi Santoso, through a written statement in Yogyakarta on Saturday, said the lava avalanches included six times upstream of Boyong River to a maximum of 1,500 meters, and 138 times upstream of Bebeng River to a maximum of 1,800 meters. “Sounds of falling were heard 27 times from Pos Babadan with low to moderate intensity,” he said as quoted by Antara on Saturday, Aug. 26, 2023.
Based on observations made via the Babadan Post on Aug. 20, 2023, white smoke with a thin to thick thickness appeared with light to moderate pressure up to 400 meters above Mount Merapi.
He said that based on the morphological analysis of the Deles5, Tunggularum, Ngepos and Babadan2 camera stations, it was observed that there were morphological changes on the southwestern dome of Mount Merapi, which were triggered by the growth activity and from lava avalanches. No significant changes were observed for the central dome.
Based on the results of the August 10, 2023 aerial photos, Agus said, the volume of Mount Merapi’s southwestern dome was measured at 2,764,300 cubic meters, and the central dome was 2,369,800 cubic meters.
The intensity of the seismicity of Mount Merapi in the last week, he continued, was greater than last week. During that period Mount Merapi experienced 139 shallow volcanic earthquakes, 780 multiphase earthquakes, 10 low frequency earthquakes, 969 avalanche earthquakes and 13 tectonic earthquakes.
The deformation of Mount Merapi, monitored this week with the EDM, showed a shortening of the descent distance by two centimeters per day.
Up to now the BPPTKG still maintains the status of Mount Merapi at Level III or Standby. The potential danger from falling lava and hot clouds can affect Kali Woro up to three kilometers from the summit and Kali Gendol up to five kilometers from the summit.
Additionally, lava avalanches and hot clouds can hit the Boyong River up to five kilometers from the summit and the Bedog, Krasak and Bebeng rivers up to seven kilometers from the summit.
If an explosive eruption occurs, he said, the ejection of volcanic material from Mount Merapi can reach an area within a three-kilometer radius of the mountain top.
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