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International Journal of Earth Sciences

, Volume 103, Issue 7, pp 1733–1745 | Cite as

Moho structure of Central America based on three-dimensional lithospheric density modelling of satellite-derived gravity data

  • Oscar H. Lücke
Original Paper

Abstract

The Central American isthmus hosts a highly variable Moho structure due to the diverse origin and composition of the crustal basement and the influence of large-scale neotectonic processes. Gravity data from the combined geopotential model EGM2008 were interpreted via forward modelling to outline the three-dimensional lithospheric density structure along the Middle American Trench, as well as the segmentation of the oceanic Cocos and Nazca plates and the overriding Caribbean plate. In this work, results for the depth of the Moho obtained from the density model are presented. The Quaternary volcanic arc correlates with a maximum Moho depth of 44 km in western Guatemala. To the south-east of the continental shelf, the Caribbean plate shows Moho depths between 20 and 12 km whereas to the north, values as shallow as 8 km are observed at the Cayman trough. For the oceanic Cocos plate, depths between 16 and 21 km are obtained for the Moho along the Cocos ridge, contrasting with values between 15 and 12 km for the seamount segment and 8 and 11 km for the segments of the crust that are not affected by the Galapagos hot-spot track.

Keywords

Moho Satellite Gravity Density model 

Notes

Acknowledgments

The author sincerely acknowledges the support of the German Academic Exchange Service (DAAD) as well as the University of Costa Rica (UCR), the Collaborative Research Centre 574 and the Special Priority Program 1257 ‘Mass Transport and Mass Distribution in the Earth System’ of the German Research Foundation (DFG). Sincere thanks are also expressed to Prof. Dr. Götze and the members of the working group on Geophysics and Geoinformatics at the University of Kiel for their scientific contributions throughout the gravity modelling process and Dr. W. Pérez for her insights into Central American volcanism. This publication is contribution no. 225 of the Sondernforschungsbereich 574 ‘Volatiles and Fluids in Subduction Zones’ at Kiel University.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  1. 1.Abt. Geophysik, Institut für GeowissenschaftenChristian-Albrechts-UniversitätKielGermany

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