Servicio Nacional de Geología and Minería (SERNAGEOMIN) Observatorio Volcanológico de Los Andes del Sur (OVDAS) and ONEMI reported the continuing, slow growth of the lava dome in Nevados de Chillán?s Nicanor Crater during 11-17 September.
Gas emissions persisted, and sometimes contained ash.
Periodic explosions sometimes ejected material that was deposited around the crater.
Notably, at 0057 on 12 September, an explosion associated with a partial dome-collapse event ejected incandescent material 700 m above the crater rim and onto the flanks.
An explosion at 2224 on 13 September generated ash plumes that rose 2.5 km above the crater rim.
The event also ejected incandescent material to the SE, and generated a pyroclastic flow that traveled as most 400 m E.
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),Volcanes de Chile