Global Volcanism Program | Image GVP-05573
The glacial icecap of Nevado del Ruiz volcano towers above the headwall of the Azufrado valley on the NE flank. Debris-avalanche deposits of a roughly 3100-year old eruption and the 1595 eruption appear in the foreground. The major eruption about 3100 years ago produced a large pyroclastic-fall deposit, the debris avalanche, and associated lahars and pyroclastic surges. The 1595 eruption, the largest from Ruiz in historical time, was similar. Lahars in 1595 caused over 600 fatalities.
Photo by Jean-Claude Thouret (Université Grenoble).