In the coastal zone of the O'Higgins Region, Central Chile, between 33°56 'S and 34°41 'S a hierarchy of environmental fragility has been established by means of the identification of physiographic units and actual morphogenetic processes through the interpretation of topographic charts, remote sensing and a detailed fieldwork . Using a GIS the surface area affected by the processes mentioned above was quantified in each physiographic unit. The quantification of the processes indicate that the most fragile units are the systems of marine terraces, dead cliffs and small valleys' slopes with 7,5%, 5,4% and 4,9% of their respectively. This method allows a faster comprehension of the morpho-conservation state of physiographic units in the coastal fringe in the mediterranean morphoclimatic domain.
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