PVMBG reported that during 7-13 December the lava dome in Merapi?s summit crater grew at a rate of 2,200 cubic meters per day.
By 13 December the volume of the dome, based on photos taken from the SE, was an estimated 359,000 cubic meters.
White emissions of variable density rose a maximum of 200 m above the summit.
The Alert Level remained at 2 (on a scale of 1-4), and residents were warned to remain outside of the 3-km exclusion zone.
Source: Pusat Vulkanologi dan Mitigasi Bencana Geologi (PVMBG, also known as CVGHM)