Documento: 00186
Título: San Miguel volcano and its volcanic hazards, El Salvador.
Autor: Escobar, Carlos Demetrio.
Fuente: Michigan; Michigan Technological University; 2003. 181 p. ilus, mapas, tab, graf.
Descriptores: GEOLOGIA. VULCANOLOGIA. VOLCAN. ERUPCIONES VOLCANICAS. AMENAZA. MONITOREO VOLCANICO. ANALISIS DE VULNERABILIDAD --------------------------------------------------------------------------------
Resumen: San Miguel is a 2130m high composite volcano in Eastern El Salvador. It has been active for perhaps 10,000 years, and has built a symmetrical cone with upper slopes of more than 40 degrees. Its activity is strombolian, marked by spatter and ash eruptions from its summit crater and lava flows that come mainly from flak vents. A large ashfall eruption resulted in a major ashfall west of San Miguel 1800 years ago. Hazards that can be expected from future activity at San Miguel include:1. Renewed summit eruptions consisting of gas and ash emissions and, ballistic bombs which would cause severe hazards in the steep summit region and ash fallout in the areas mainly to the west of the large cone2. A lava flow eruption with accompanying spatter and bombs from a flank vent which may result in a lava flow as long as 11 kmUnlikely hazards that could occur from San Miguel include:1. An intense summit eruption could cause a lava flow to descend the cone from the summit crater and break up to form a dangerous block and ash flow2. Collapse of the San Miguel could occur which would result in a devastating debris avalanche and possibly an accompanying pyroclastic flow. Within this study, I have assembled information needed for modern hazards assessments due to future activity at San Miguel Volcano. I have also prepared preliminary hazards maps of various types, with the help of many people. The goal is to mitigate hazard by providing information to those who live near the volcano (Au) - en