During 2010 and 2011, we studied the effects of the continental uplift that resulted from the earthquake of 27F on the physical landscape and the macrofauna of sandy beaches located in front of coastal armoring along Península de Arauco and nearby areas. The mean width of uplifted beaches during the period following 27F was up to 12,5 times higher than beach widths observed before the earthquake and the beach face slope of uplifted beaches decreased. At those beaches that had coastal armoring located closer to high tides before the earthquake, the restored upper and mid shore beach levels (previously occupied by seawalls and rocky revetments) were rapidly colonized by crustacean species, which typically inhabit at similar intertidal levels of unarmored beaches of Chile. Field samplings carried out promptly after large scale disturbances have occurred, are relevant to increase knowledge on the interaction between that natural phenomenon's and coastal artificial infrastructureDurante los años 2010 y 2011, estudiamos los efectos del levantamiento costero producto del terremoto del 27F sobre el paisaje físico y la macrofauna de playas arenosas, ubicadas frente a defensas costeras artificiales en la península de Arauco y alrededores. El ancho promedio de las playas durante el periodo posterior al 27F fue hasta 12,5 veces mayor que los anchos observados antes del terremoto y la pendiente de las playas levantadas disminuyó. En playas que tenían defensas costeras ubicadas cerca del nivel de marea alta, el espacio restaurado en los niveles superiores y medios del intermareal (previamente ocupados por murallas y revestimientos rocosos), fue rápidamente colonizado por crustáceos que habitan niveles intermareales similares en playas sin defensas costeras artificiales. Estudios llevados a cabo luego de la ocurrencia de grandes perturbaciones, son relevantes para aumentar el conocimiento sobre las interacciones entre fenómenos naturales de gran escala y la infraestructura costera artificial