Volcanic News at 12/15/2014.

In Colombia, the Nevado del Ruiz introduced during the period between 2 and December 8, strong seismic activity, volcano-tectonic type related to the fracturing of rocks, LP earthquakes and tremor. Earthquakes were located northeast of Arenas crater at a depth of 1 to 4 km. The observatory of Manizales recorded a continuous deformation.

On December 15 at 7:38 local, a seismic signal corresponding to the emission of ash was confirmed by direct observations and webcam images. The ashes are falling on the western side of the volcano, and caution is recommended in the drainages of the rios Molinos, La Marcada, Guali, Azufrado and Lagunillas, and on the road from Manizales to Murillo. The alert level remains at Amarillo III / Cambios en el comportiamento of actividad volcanica.

source:
Observatorio Vulcanologico there sismologico Manizales - Boletín del Volcán Actividad Extraordinario of Nevado del Ruiz, Emisión confirmada de Ceniza, 15 de Diciembre 2014 8:15 am - link

On Sumatra, the eruption of the Sinabung continues. The extrusion of a viscous lava lobe on the south side and his partial collapse causing pyroclastic flows from small to medium size. Ash plumes are identified, amount up to 6 km. high these days.

Based on this activity, the aviation code has turned red Dec. 14 (VAAC Darwin)
 

In Iceland, the Holuhraun lava field always extends: it reached 78.6 km² on December 12 and no more kipuka is free of lava.

December 15 at 9:26, an earthquake of M 5.4 rocked the northern edge of the caldera of Bárðarbunga. The IMO reported about 40 earthquakes in the caldera in the last 24 hours, including five of M4-5 and ten of M 3-4. The eruptive dyke is rocked by ten earthquakes.