After the eruption of Nevado del Ruiz killed more than 23,000 people in Colombia in 1985, the U.S. Office of Foreign Disaster Assistance asked the U.S. Geological Survey to design a program to ...
Colombian scientists monitoring Nevado del Ruiz had cautioned town leaders ... two and a half hours after the start of the eruption, a volcanic debris flow called a lahar buried Armero.
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