Nevado del Ruiz volcano, infamous for its deadly lahars, sprang to life in March 2012. Located in the Colombian Andes, the volcano was frequently active during the past 1,000 years, most recently in 2010. Observers first reported earthquakes near the volcano, followed by emissions of volcanic gases and small amounts of ash. By early June sulfur dioxide emissions had increased. Based on analysis of satellite imagery, the Washington VAAC reported that an ash plume drifted 40 km W. The VAAC also noted that the Bogota MWO reported ash emissions drifting NNW at an altitude of 9.1 km (30,000 ft)
The activity of the volcano continues in Orange level (Level II): eruption likely within days or weeks. Still records the seismic signal associated with the emission of ash, showing the instability of the volcanic system. It is emphasized that these signals can persist for days or weeks.
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