Activity of Etna, Bogoslof and Sinabung.

At Etna, with the small strombolian activity remaining in the saddle between the two southeast craters, small changes in contours are beginning to be noticed.

Source: Boris Behncke

The fluctuating life of a volcanic island is illustrated by the case of Bogoslof: the eruptive activity at the end of January 2017 generated 0.4 km² of new land. On 31 January, the surface of the island had tripled with respect to the surface before eruption.
Since then, a double phenomenon has caused it to lose its surface: marine erosion for a small part, and on the other hand the expansion of the seawater central lake : in 15 days, the surface has decreased by 1.02 Km² to 0,815km².
As activity since January 31 has not contributed much to its expansion, erosion may take precedence in the future.
 
Source: AVO

In Sinabung, a collapse of the lava lobe occurred on 22 February in both the ESE and SSE sectors.
On 24 February at 11:54 WIB, an eruption was accompanied by a plume of 2,500 meters, dispersing towards the west-southwest.

Sources: PVMBG, Sadrah Peranginangin and Beidar Sinabung