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Thermal structure of the Panama Basin by analysis of seismic attenuation.

Vargas, C.A. and Pulido, J.E. and Hobbs, R.W. (2018) 'Thermal structure of the Panama Basin by analysis of seismic attenuation.', Tectonophysics., 730 . pp. 81-99.

Abstract

Using recordings of earthquakes on Oceanic Bottom Seismographs and onshore stations on the coastal margins of Colombia, Panama, and Ecuador, we estimate attenuation parameters in the upper lithosphere of the Panama Basin. The tomographic images of the derived coda-Q values are correlated with estimates of Curie Point Depth and measured and theoretical heat flow. Our study reveals three tectonic domains where magmatic/hydrothermal activity or lateral variations of the lithologic composition in the upper lithosphere can account for the modeled thermal structure and the anelasticity. We find that the Costa Rica Ridge and the Panama Fracture Zone are significant tectonic features probably related to thermal anomalies detected in the study area. We interpret a large and deep intrinsic attenuation anomaly as related to the heat source at the Costa Rica Ridge and show how interactions with regional fault systems cause contrasting attenuation anomalies.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1016/j.tecto.2018.02.017
Publisher statement:© 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/).
Date accepted:25 February 2018
Date deposited:27 March 2018
Date of first online publication:08 March 2018
Date first made open access:27 March 2018

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