OVSICORI-UNA reported that at 1610 on 8 February an ash plume rose 300 m above Turrialba's active vent and drifted N.
An event at 1531 on 10 February also produced an ash plume but inclement weather prevented estimates of the plume height.
During 11-12 February variable amplitude tremor was detected, and at night hot blocks ejected from the vent landed in Cráter Central.
Several events on 13 February (at 0255, 0305, 0415, and 1459) produced ash plumes that rose as high as 1 km and drifted N, NW, and W.
Several small ejections of incandescent material fell around the active crater during the early morning.
On 14 February continuous emissions of gas and steam with low ash content were visible.
A strong sulfur odor was reported in San Pablo de Oreamuno (25 km SW).
Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)