Global Volcanism Program | Image GVP-09138
A road to the summit of Irazú made its 1963-65 eruptions easily accessible to the public. This 1964 photo shows crowds of visitors at the edge of the active crater; seven people were killed and many more injured by explosive ejecta in April and August of that year. Secondary mudflows produced when thick ashfall deposits were remobilized also caused fatalities. Over a 2-year period, 46 mudflows occurred along the Río Reventado valley; one killed at least 20 people and destroyed 400 houses and some factories.
Anonymous, 1964 (published in Alvarado, 1989).