Structural Vulnerability Functions for Volcanic Ash Fall. Case Study: Unión Juárez, Chiapas, Mexico

David A Novelo-Casanova, National Autonomous University of Mexico, Department of Seismology, Ciudad DE Armería, Mexico and Maria Guadalupe Hernández-Bello Miss, Universidad Nacional Autónoma de México, Posgrado en Ciencias de la Tierra, Mexico City, Mexico