Morpho-Structural Comparison of Latin American Volcanoes.

The geomorphometric classifications of local topographic gradients of two groups of Andean volcanoes situated in the Andes Cordillera are introduced and compared. Input data are eight topographic gradients obtained by processing each volcano raster Digital Elevation Models extracted from ASTER stereo-pairs. Based on these data, the pixels have been classified into 17 classes through a clustering procedure applied to coordinates resulting from Principal Component Analysis. The resulting thematic colour maps show the spatial distribution of homogeneous landform units, highlighting the impact of erosional and tectonic processes on the whole relieves. The comparison of the corresponding classes of the different volcanoes may be interpreted as similarity among the volcanoes.