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is the fourth tallest mountain in Costa Rica (11,260 feet). It is approxi¬ mately 15 miles east of San Jose, the capital, which has a population of approximately 100,000 (fig. 1). Prevailing easterly winds carry ash from Irazti directly over San Jose. The next closest town, Cartago, is approxi¬ mately 9 miles southwest of Irazti and generally out of the path of volcanic ashfall. Volcanic Activity The volcanic activity of Irazu has been stud¬ ied for many years (1). Various observers in San Jose report that the volcano, active in 1841 and again in 1910, had been relatively inactive until March 1963. At that time there was ex¬ tensive volcanic activity resulting in heavy ashfall in San Jose, which has continued intermittently (fig. 2). Elliot Coen, chief of the national meteorologic services, Costa Rica, has maintained a daily record of ashfall in

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