I just wanted to pass a quick new news from Colombia: Nevado del Ruiz has been placed on yellow alert status (spanish) by the Colombian survey, INGEOMINAS. The reports (spanish) describe increased sulfur odor and sulfur dioxide emissions, increased seismicity in the edifice (tens of earthquakes) over the weekend and a plume (unclear if the plume is only steam or more). You can read the full INGEOMINAS statement here (spanish). No evacuations have been called by the government, but towns around the volcano are being placed on heightened alert. Ruiz has not had any confirmed eruptive activity since 1991, the last of the eruptive period that included the 1985 lahars that killed over 25,000 in Armero. The volcano is monitored by the observatory in Manizales (spanish), where you can see the a "capture" of the seismic trace at Ruiz but I have yet to find any webcam for Ruiz.
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