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Nevado del Ruiz volcano
stratovolcano 5321 m / 17,457 ft
Colombia, 4.9°N / -75.32°W
Current status: minor activity or eruption warning (3 out of 5)
Nevado del Ruiz webcams / live data | Reports
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Nevado del Ruiz volcano eruptions:
2015-16 (ongoing), 2014-15, 2012-13, 1994 (?), 1985-91, 1984-85, 1916, 1845, 1833?, 1831, 1829, 1828, 1826(?), 1805, 1623, 1595, 1570, 1541(?)
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Nevado del Ruiz volcano news & activity updates

Nevado del Ruiz volcano (Colombia): increasing signs of unrest

Tuesday Dec 02, 2014 09:46 AM | BY: T

Aerial image of Nevado del Ruiz on 24 Nov 2014 (INGEOMINAS)
Aerial image of Nevado del Ruiz on 24 Nov 2014 (INGEOMINAS)
Steaming Nevado del Ruiz on 29 Nov 2014 (INGEOMINAS)
According to the latest report of the Manizales observatory, the volcano's activity recently changed and is showing increased signs of unrest, which could announce a new eruption to come.
A recent aerial survey by the Colombian air force revealed a deposit of fresh ash on the southern flank, indicating that at least sporadic explosions or ash emissions - presumably phreatic in nature - do indeed occur.
In addition, since about 2 weeks ago, seismic activity has been significantly higher than previously. Phases of tremor and more frequent shallow volcano-tectonic earthquakes suggest increased movements of fluids (magma, gas, water) inside the volcano. Most of the events are concentrated in an area southeast under Arenas crater.

According to a press article, the volcano observatory considers raising the alert level to orange if activity continues to pick up and the risk of a new eruption increases. Authorities have been advised to prepare for possible evacuation scenarios.
Beatriz Valencia, major of Murillo, the closest town at the volcano, said in an interview that although much progress has been done in the past few years, much work on infrastructure is still needed should a volcanic crisis emerge: there should be more vehicles, roads, and communication facilities (mobile networks are not available in all areas).
Links / Sources:
Previous news
Current seismic signal from Nevado del Ruiz volcano (OLL station, INGEOMINAS)
Wednesday, Jan 22, 2014
No major changes have occurred over the past week. The volcano produces intense degassing, with steam/gas plumes rising up to 2.5 km above the crater. Seismic activity has remained similar to past weeks at fluctuating low to medium levels. ... [more]
SO2 plume from Nevado del Ruiz volcano (NOAA)
Monday, Jan 13, 2014
Over the past weeks, the volcano continued to have rather low seismic activity, mainly in the "usual" area S and SE of the Arenas crater at approx 8 km depth. At the surface, the volcano produces intense degassing with a plume sometimes reaching 1.5 km height. [more]
Wednesday, Dec 18, 2013
Volcanic activity at the surface (degassing) and inside (earthquakes) has remained comparably low. ... [more]
Seismic signal from Nevado del Ruiz today (OLL station, INGEOMINAS)
Monday, Oct 07, 2013
An earthquake swarm affected the volcano on 7 Oct, including a volcanic-tectonic quake of magnitude 2.7 at 3.2 km depth northeast of the Arenas crater. This could indicate that new magma has been rising into the shallow volcano's conduit, which might (or not) lead to new eruptive activity. [more]
Nevado del Ruiz yesterday (INGEOMINAS)
Saturday, Sep 14, 2013
The volcano has had a phase of increased degassing producing an important SO2 plume visible on satellite data. No reports of other unusual activity have become known. [more]

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