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Nevado del Ruiz volcano (Colombia): increasing volcanic unrest

Fri, 9 Mar 2012, 17:14
17:14 PM | BY: T
The snow-caped summit and steaming crater of Nevado del Ruiz volcano on 8 March
The snow-caped summit and steaming crater of Nevado del Ruiz volcano on 8 March
Nevado del Ruiz volcano's crater seen on 8 Mar 2012. Scientists measured a strong heat source.
Nevado del Ruiz volcano's crater seen on 8 Mar 2012. Scientists measured a strong heat source.
Colombia's Nevado del Ruiz volcano has been showing increasing signs of volcanic unrest and might be close to an eruption, INGEOMINAS reports in their latest special bulletin.
An overflight on 8 March revealed intense steaming from the main crater and the presence of ash on the summit glacier, the crater rim and on the volcano's eastern flanks, probably from the phreatic explosions reported earlier since 22 Februry. The steam plume reached an inpressive 1400 m (4,500 ft) height.
In addition, a thermal anomaly can be identified in the crater and levels of SO2 emission, as well as seismic activity with tremor signals have increased. This all adds to the likelyhood of a new eruption from the volcano, which, during its infamous 1985 eruption, killed about 30,000 people by a deadly lahar in the village of Armero.

Nevado del Ruiz volcano (Colombia), activity update: increase in shallow earthquakes under Arenas crater

Sun, 26 Feb 2012, 06:56
06:56 AM | BY: T
From 12:30 hours local time on February 23, a new increase in seismic activity of the Nevado del Ruiz volcano began, characterized by the occurrence of shallow earthquakes associated with fluid movements and fracturing of rock. INGEOMINAS also measured increased SO2 emissions and some changes in strain measurements.
So far, the energy level of this increase is low compared with previous episodes of unrest, but small eruptions in the near future are possible.
The seismicity is located under the active Arenas crater at depths ranging between 0.5 and 3 km, and reached a maximum recorded magnitude of 1.4 on the Richter scale.

Previous news

Thu, 23 Feb 2012, 06:51

Smithsonian / USGS weekly report 15-21 February 2012 - summary

The new Smithsonian / USGS Weekly Volcanic Activity Report is out. Updates include: ... Read all
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