期刊
TECTONOPHYSICS
卷 394, 期 3-4, 页码 193-219出版社
ELSEVIER
DOI: 10.1016/j.tecto.2004.07.059
关键词
brittle deformations; quaternary marine terraces; Neogene shelf deposits; Andean fore arc tectonics
Neotectonic observations allow a new interpretation of the recent tectonic behaviour of the outer fore arc in the Caldera area, northern Chile (27 S). Two periods of deformation are distinguished, based on large-scale Neogene to Quaternary features of the westernmost part of the Coastal Cordillera: Late Miocene to Early Pliocene deformations. characterized by a weak NE-SW to E-W extension is followed by uppermost Pliocene NW-SE to E-W compression. The Middle Pleistocene to Recent time is characterized by vertical uplift and NW-SE extension. These deformations provide clear indications of the occurrence of moderate to large earthquakes. Microseismic observations, however. indicate a lack of shallow crustal seismicity in coastal zone. We propose that both long-term brittle deformation and uplift are linked to the subduction seismic cycle. (C) 2004 Elsevier B.V. All rights reserved.
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