Boletín de Geología

Vol. 46 No. 3 (2024): Boletín de Geología
Tribute to the work of Dr. Gerardo Botero-Arango

Considerations on the crustal seismic structure in the northernmost Central Cordillera of Colombia – “Altiplano Antioqueño”

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  • Gaspar Monsalve,
  • Andrés F. Muñoz-Calderón,
  • David Santiago Avellaneda-Jiménez,
  • Sebastián Ramírez-Flórez
Gaspar Monsalve
Universidad Nacional de Colombia
Andrés F. Muñoz-Calderón
Universidad Nacional de Colombia
David Santiago Avellaneda-Jiménez
Carnegie Institution for Science
Bio
Sebastián Ramírez-Flórez
Universidad Nacional de Colombia
DOI: https://doi.org/10.18273/revbol.v46n3-2024011

Published 2024-11-28

Keywords

  • Altiplano Antioqueño,
  • Antioquia Batholith,
  • Crustal thickness,
  • Receiver function,
  • Seismicity,
  • Focal mechanism
    • ...More
    Less

How to Cite

Monsalve, G., Muñoz-Calderón, A. F., Avellaneda-Jiménez, D. S., & Ramírez-Flórez, S. (2024). Considerations on the crustal seismic structure in the northernmost Central Cordillera of Colombia – “Altiplano Antioqueño”. Boletín De Geología, 46(3), 247–263. https://doi.org/10.18273/revbol.v46n3-2024011

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Abstract

The “Altiplano Antioqueño” (Antioquia Plateau) is located in the northern portion of the Central Cordillera of Colombia, and comprises a series of erosion surfaces geologically dominated by the Antioquia Batholith. The nature of the crustal deformation in the area is still enigmatic. In this contribution we integrate various elements to elucidate the seismic structure of the crust, including the use of the seismological receiver function technique to estimate crustal thickness, the analysis of instrumental seismicity, and the calculation of focal mechanisms for earthquakes in the area with magnitudes greater than 3; the integration of these observations with current knowledge of the lithologies and the regional faults, facilitates a better approximation of the crustal structure and the nature of the present deformation. In particular, teleseismic receiver functions suggest crustal thicknesses between 45 and 55 km, especially in the western flank of the plateau; the receiver functions do not provide conclusive data regarding crustal thickness near its eastern boundary. The instrumental seismicity shows a concentration of earthquakes along the borders of the Antioquia Batholith, with a relative absence of seismicity within this body. The focal mechanisms indicate thrust faulting at the western border of the batholith, whereas at the eastern border they show strike-slip faulting.

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