Examinando por Materia "Volcanic rocks"
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Publicación Comment on ‘Petrotectonic characteristics, geochemistry, and U–Pb geochronology of Jurassic plutons in the Upper Magdalena Valley-Colombia: Implications on the evolution of magmatic arcs in the NW Andes’ by Rodríguez et al. (2018)(PERGAMON-ELSEVIER SCIENCE LTD, 2019-11-01) Bustamante C.; Cardona A.; Bustamante A.; Vanegas J.; Universidad EAFIT. Departamento de Ciencias; Geología Ambiental y Tectónica[No abstract available]Publicación Estratigrafía, petrología y geoquímica de las rocas volcánicas del flanco occidental del volcán Puracé, alrededores de Coconuco(Universidad EAFIT, 2009) López Castro, Sandra Milena; Toro Villegas, Gloria Elena; IngeominasThe cartographic and allostratigraphic analysis of volcanic rock outcrops surrounding the Coconuco municipality gather new data which expands the knowledge of volcanism in southwestern Colombia. The cartography of 10 allostratigraphic and 11 geomorphologic units allowed to define a general allostratigraphic column for the region in order to describe the intercalation and interdigitation of lava flow deposits and pyroclastic deposits associated with the Coconucos volcanic chain, located in the western flank of the Puracé Volcano between 2400 and 3200 masl.Ítem Las rocas de Colombia / por Ricardo Lleras Codazzi, profesor de mineralogía y geología en la Universidad Nacional, Conservador del Museo de Historia Natural(Bogotá : Imprenta Nacional, 1928) Lleras Codazzi, Ricardo, 1869-1940Publicación Prediction of landslide occurrence in urban areas located on volcanic ash soils in Pereira, Colombia(Springer Verlag, 2004-01-01) Rios, D.A.; Hermelin, M.; Universidad EAFIT. Departamento de Ciencias; Geología Ambiental y TectónicaAs a result of the 25 January 1999 Armenia earthquake, the city of Pereira (400,000 inhabitants), located on a volcanic ash-covered alluvial fan in the western limit of the Central Cordillera (Colombia), suffered 250 slope movements. After a complete inventory, a monitoring process of unstable areas was designed, based on repeated topographic surveys, soil pore saturation levels and visual inspections. The participation of the communities was crucial and permitted the prediction of slope movements between 2 weeks and 3 months in advance and the evacuation of the inhabitants. Three specific examples are discussed. The method could be improved by excavating observation trenches and observing in detail local rainfall. In all cases, the strong involvement of the community was considered indispensable for the success of the process. © Springer-Verlag 2004.