T298 Landscape Records of Earthquake Deformation (Posters)

Wednesday, 22 October 2014
9:00 AM - 6:30 PM
Exhibition Hall C

LARGE MORPHOTECTONICS ELEMENTS RELATED TO NEOTECTONICS AND SEISMICITY OF EAST FLANK OF COLOMBIAN EASTERN CORDILLERA (4° - 5° N,  73° - 74° W)

Paper number: T298-19
Program: Technical Sessions
Time: 9:00 AM – 6:30 PM

Authors

Abstract

The Colombian Eastern Cordillera was result of the fast rising of Mesozoic and Cenozoic rocks in last 8 million years when a Late Jurassic rift basin suffered a tectonic inversion. The development of Late Jurassic rift basin produces the cortical breaking that produces normal faults parallel to depocenter axis.

In Late Cretaceous because to collision of the Caribbean plate with northwestern corner of South America a strong compressive stress was occur and kinematics changes were presented in the normal faults restrained to the basin, where these were converted in inverse faults. Result of this in Paleogene was produced a first shortening step that leave an immature fragmented Eastern cordillera. Then from Late Miocene to Present times the Eastern Cordillera presents a definitive growth by the Nazca plate subduction evolution.

Several geomorphic features of the east flank of the Eastern Cordillera are related to morphotectonics, and these are related to the active faults configuration that derived of Cenozoic – Quaternary tectonic activity in spite of the high rainfall that has stayed constant most of the Quaternary with their subsequent erosive process.

We indicate that the faults associated to the morphotectonics features in a regional scale are related with the seismic activity of this Eastern cordillera sector because they leave neotectonics evidences in some places.