ONEMI and SERNAGEOMIN reported that during 5-12 February growth of the lava dome in Nevados de Chillán?s Nicanor Crater was very slow (10.8 cubic meters per hour).
White water vapor emissions, occasionally grayish from included tephra, rose as high as 1.7 km and drifted SE and NE.
Crater incandescence was recorded by a webcam each day.
At 0109 on 15 February an explosive event partially destroyed the lava dome and ejected incandescent material onto areas near the crater.
The Alert Level remained at Orange, the second highest level on a four-color scale, and residents were reminded not to approach the crater within 3 km.
ONEMI maintained an Alert Level Yellow (the middle level on a three-color scale) for the communities of Pinto, Coihueco, and San Fabián.
Sources: Oficina Nacional de Emergencia-Ministerio del Interior (ONEMI) ,Servicio Nacional de Geología y Minería (SERNAGEOMIN)