Examinando por Materia "Ambiente compresivo-transcurrente"

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    Inestabilidad volcánica y formación de flancos de colapso en la Zona Volcánica Norte de Suramérica
    (Universidad EAFIT, 2021) Palacios Benavides, Dumar Alexander; Duque Trujillo, José Fernando
    The north of South America is marked by the subduction of the Nazca and Cocos plate under the South American continental plate, this subduction has given rise to the Andes Mountains and has allowed the formation of the Northern Volcanism of the Andes. This volcanic area is formed in a transpressive environment where shear faults have been formed, which are the main source of instability in volcanoes, whose physical response is the collapse flanks, which are large mass movements that completely modify the volcanic building. To determine if there is a direct relationship in the formation of collapse flanks with the direction, location and displacement of the faults in the Northern Volcanic Zone, the directions of the faults and collapse flanks were measured in 37 volcanoes between Colombia and Ecuador. It was found that the faults have a mean direction of 030 ° (NE), the collapse flanks have two formation trends with respect to the direction of the faults, oblique 340 ° (NW) or perpendicular 290 ° (W). This is consistent with data obtained in analogous experiments by Lagmay et al. (2000), Wooler et al (2009) and Andrade et al., (2019). The formation of the flanks in the measured directions confirms that there is a direct relationship with the faults and, therefore, it can be stated that in the northern volcanic zone of the Andes these collapses tend to form mainly towards the WNW or NNW.