TEMPO.CO, Yogyakarta - The Institute for Research and Development of Geological Disaster Technology (BPPTKG) recorded three rock-falls at the peak of Central Java volcano Merapi on Saturday, Jan. 26.
BPPTKG stated on its official Twitter account that it recorded three-time rock-falls based on observations from 00:00 to 06:00 Western Indonesia Time (WIB). Based on the seismic data, the rock-fall lasted for 22-57 seconds.
The weather on Mount Merapi on Saturday morning was reportedly cloudy despite clear visibility. The wind blew calmly over the volcano, with the air temperature recorded at around 22.5 degrees Celsius, air humidity reached 78 percent RH, while the air pressure was 917.2 Hpa.
Based on BPPTKG's morphology analysis of the Mount Merapi lava dome as of January 22, 2019, the volume of lava domes reached 461,000 cubic meters, with a growth rate of 1,300 cubic meters per day or smaller than the previous week.
Currently, Merapi lava domes are still stable, with a low growth rate, on an average, less than 20,000 cubic meters per day.
Referring to Merapi`s volcanic activity data, until now, the BPPTKG still maintains the status of the volcano at level II, or Alert, and for the time being, the agency does not recommend climbing activities except for the purposes of investigation and research related to disaster mitigation efforts.
The BPPTKG has urged residents to not conduct activities within a three-kilometer radius of Mount Merapi`s peak.