Global Volcanism Program | Image GVP-09314
Ashfall from the 1963-65 eruption of Irazú affected both populated areas and agricultural lands. In the weeks following the beginning of the eruption on March 13, 1963 dense ashfall at times restricted visibility to 30 m in the capital city of San José, paralyzing traffic. Ashfall caused extensive damage to farmlands, and about 2000 dairy cows either died of disease and malnutrition or had to be killed. Remobilization of the heavy ash blanket during the rainy season caused mudflows that destroyed houses, roads, and bridges, and caused fatalities.
Photo by W. Schaer (published in Barquero, 1998).