description Nevado del Ruiz Overview
Nevado del Ruiz is a glaciated stratovolcano in the Colombian Andes, rising to 5,321 m in the Cordillera Central. It is part of the Pacific Ring of Fire and has erupted repeatedly throughout recorded history. Its most devastating eruption occurred on November 13, 1985, when pyroclastic flows melted summit ice and generated lahars that destroyed the town of Armero, killing approximately 23,000 people. The volcano remains active and is closely monitored by Colombian geological authorities.
help Nevado del Ruiz FAQ
How did Nevado del Ruiz cause the Armero disaster?
Its eruption on November 13, 1985 melted part of the summit ice cap and generated fast-moving lahars. One of those volcanic mudflows overwhelmed Armero, killing more than 20,000 people in the town.
Why can a relatively small eruption at Nevado del Ruiz be so dangerous?
The volcano's summit glaciers provide water that can mix rapidly with ash and rock to form lahars. River valleys can channel those flows far from the crater, putting downstream communities at risk.
Is Nevado del Ruiz still an active volcano?
Yes, it remains an active stratovolcano monitored by Colombia's geological authorities. Its activity can include gas emissions, earthquakes, and ash releases even when no disaster-scale eruption is occurring.
Can climbers freely ascend Nevado del Ruiz?
Access has often been restricted because of volcanic hazards and changing alert levels. Anyone planning a visit must check current guidance from Colombian park and geological authorities rather than relying on an older climbing itinerary.
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