BPPTKG reported that the lava dome just below Merapi?s SW rim and the lava dome in the summit crater both continued to extrude lava during 23-29 April.
The SW rim lava dome had an estimated volume of 1,141,850 cubic meters on 28 April, with a growth rate of about 11,900 cubic meters per day, and continued to shed material down the flank.
A total of 12 pyroclastic flows traveled a maximum of 2 km down the SW flank.
Incandescent avalanches, recorded 113 times, traveled as far as 2 km down the SW flank.
The volume of the summit lava dome was 1,794,000 cubic meters on 28 April, unchanged from the previous week.
Electronic Distance Measurement (EDM) data showed a distance shortening between points in the NW at a rate of 0.5 cm per day, indicating inflation.
The Alert Level remained at 3 (on a scale of 1-4), and the public was warned to stay 5 km away from the summit.
Source: Balai Penyelidikan dan Pengembangan Teknologi Kebencanaan Geologi (BPPTKG)
Asosan (Japan)