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Resumen. La Zona de Falla Atacama, que recorre la Cordillera de la Costa del norte de Chile a lo largo de unos 1.000 km, esta formada por una serie de fallas de rumbo general norte-sur. La falla principal del sistema al norte de Paposo (24°00'-24°45'S), denominada aqui Falla Paposo, presenta un escarpe cara al este, de hasta unos 300 m de altura, producto del alzamiento relativo del bloque occidental. El escarpe de la Falla Paposo produjo el entrampamiento de un sistema de drenajes locales, de edad miocena o mas antigua, de direccion general este-oeste, lo que origino la depositacion de "playas" o "lagos secos" en estas cuencas cerradas por el escarpe. Eliminando la topografia que corresponde a los rasgos del escarpe, se verifica que los ejes del drenaje atraviesan la falla sin desviacion lateral alguna, indicando que el movimiento generador del escarpe de falla fue vertical, sin componente en el rumbo. El movimiento vertical se produjo con posterioridad a los 19 Ma, edad de un flujo piroclastico "colgado" en el escarpe y depositado desde el este, antes de la existencia del relieve de falla. Un nivel de cenizas datado en 5,5 Ma, esta interestratificado en conos de deyeccion producto de la erosion del escarpe, indicando su presencia ya en esa epoca. El periodo de actividad vertical de la Falla Paposo se ubica en el intervalo de tiempo entre los 19 y 5,5 Ma (Mioceno Inferior - Mioceno Superior). En la zona no se han hallado evidencias de actividad de la Falla Paposo, con posterioridad al Mioceno. Abstract. The Atacama Fault Zone, located in the Coastal Range of northern Chile, is composed of a system of parallel trending faults with a general north-south arrangement. In the area north of Paposo (24°00'-24°45'S), the most important fault of the system is here named Paposo Fault and has produced an east-facing scarp up to 300 m high, with upward movement of the western block. The Paposo Fault scarp interrupts a preexisting drainage pattern of local origin, and Miocene or older age, forcing the deposition of "playas" or "dry lakes". By eliminating the topographic features produced by the scarp it is seen that the drainage axis crosses the fault zone with no lateral displacement, a clear indication that the scarp generating movement was vertical, with no along-strike component. The vertical activity of the Paposo Fault occurred alter the deposition of a 19 Ma pyroclastic flow located to the west of the scarp. If the scarp would have been there at the moment of the east coming flow, it is unlikely that it could have reached its current position. An ashfall deposit, dated in 5.5 Ma is interbedded in an alluvial fan produced by the erosion of the scarp, indicating that it already existed by that time. The vertical activity of the Paposo Fault is then located somewhere between 19 and 5.5 Ma (Lower-Upper Miocene). No evidence of post-Miocene activity of the Paposo Fault has been detected in the study area.

Movimiento normal de la Falla Paposo, Zona de Falla Atacama, en el Mioceno, Chile