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| Keywords: Volcan de Fuego pyroclastic flows - october 1974 eruption.jpg Volcán de Fuego ” in October 1974 Guatemala One of the largest historical eruptions of Volcán de Fuego Ash clouds rise off the base of the pyroclastic flows which traveled up to 7 km from the summit at estimated average velocities of 60 km/hr The travel direction of pyroclastic flows is influenced by topography The denser basal portion of the pyroclastic flows follows topographic lows on the flanks of the volcano ” note a smaller pyroclastic flow descending a gully at the right http //www volcano si edu/world/volcano cfm vnum 1402-09 volpage photos photo 039022 William Buell Smithsonian Institution 1974-10 PD-USGov Volcán de Fuego in 1974 Volcanic eruptions in 1974 Volcanic eruptions of Fuego Pyroclastic flows | ||||
