BPPTKG reported that the 2021 lava dome just below Merapi?s SW rim and the new lava dome in the summit crater both continued to grow during 12-18 February.
The 2021 lava dome volume was an estimated 397,500 cubic meters on 17 February, with a growth rate of about 25,200 cubic meters per day; it was 258 m long, 133 m wide, and 30 m high.
The summit lava dome was an estimated 426,000 cubic meters, with a growth rate of about 10,000 cubic meters per day; it was 160 m long, 120 m wide, and 50 m high.
Seismicity was less intense than the previous week.
Electronic Distance Measurement (EDM) data showed no notable deformation.
PVMBG noted that foggy conditions often prevented visual observations during 18-23 February, though sometimes white emissions were observed rising up to 400 m above the summit.
The Alert Level remained at 3 (on a scale of 1-4), and the public were warned to stay 5 km away from the summit.
Sources: Balai Penyelidikan dan Pengembangan Teknologi Kebencanaan Geologi (BPPTKG),Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)