Observatorio Volcanológico de los Andes del Sur (OVDAS)-SERNAGEOMIN and ONEMI reported increased activity at Planchón-Peteroa beginning in the morning of 16 December.
Low-intensity pulses of tremor were detected by the seismic network and associated with pulsating grayish gas emissions which rose no higher than 800 m above the vent rim.
Webcams recorded crater incandescence during the night of 15-16 December.
The Alert Level remained at Yellow (the middle level on a three-color scale) for the volcano, and ONEMI maintained Alert Level Yellow for the communities of Molina (66 WNW), Curicó (68 km NW), Romeral (75 km NW), and Teno (68 km NW).
Sources: Oficina Nacional de Emergencia-Ministerio del Interior (ONEMI) ,Servicio Nacional de Geología y Minería (SERNAGEOMIN)