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DOI: 10.12957/geouerj.2013.6912 El presente trabajo utiliza el modelo de Suzuki(Suzuki, 1983)para simular la caida de cenizavolcanica em la version TEPHRA (Connors, 1991). El programa TEPHRA modificado ESsometido a prueba al simular exitosamente la distribucion de ceniza de los eventos eruptivosmejor conocidos em el volcan Irazu, Costa Rica. Adicionalmente, la masa de ceniza acumuladapor 52 simulaciones de diseno concuerda satisfactoriamente con la distribucion de las isopacas dela ceniza depositada durante elperiodo1963-65 del volcan Irazu y relativamente bien con ladistribucion de isopacas de la ceniza depositada durante los ultimos 2600 anos de actividad. Estasituacion justifica la aplicacion del programa TEPHRA modificado em la elaboracion de mapasde amenaza por caida de ceniza para el Volcan Irazu y otros volcanes em los cuales se tengaapropiada informacion sobre direccion Del viento y caracteristicas eruptivas mas probables depresentarse em el volcan. Palabras Clave: Caida de ceniza, simulacion computacional, mapas de amenaza, TEPHRA,escenarios de riesgo, Volcan Irazu. Abstract This paper uses the Suzuki volcanic ash simulation model (Suzuki, 1983)to simulate volcanicashfall in the tephra versionTEPHRA (Connors, 1991).The modified TEPHRA volcanic ashsimulation program has been used to develop computer simulations of volcanic ashfall producedby Irazu volcano, Costa Rica.The ability of the modified TEPHRA program to simulate volcanicashfalls is tested by reproducing successfully the ash fall distribution ofthe best known eruptiveepisodes from the 1963-1965 active period. Additionally, the mass of accumulated ash during 52simulations agrees very well with the ash isopachs deposited during the 1963-1965 active periodand well with the distribution of ash isopachs deposited during the last 2600 years. We concludethat the modified TEPHRA program is suitable to prepare ash fall hazards maps for Irazu andother volcanoes, on the condition that there is good knowledge of their most likely eruptivecharacteristics and local wind direction. Key words: Ashfall, computer simulations, TEPHRA, hazards maps, risk scenarios, Irazuvolcano.

Simulación de caída de ceniza del Volcán Irazú aplicando el programa TEPHRA modificado