The Earth's Magnetic Interior pp 43-81

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Electromagnetic Images of the South and Central American Subduction Zones

Chapter

Abstract

Current and fossil plate margins offer some of the most rewarding targets for geophysical studies. Particularly, the fluid/melt cycle in subduction zones continues to be of major interest for seismological as well as deep electromagnetic (EM), specifically magnetotelluric investigations. In this contribution we describe a number of experiments which have been conducted in several ocean-continent convergence zones around the world, with a focus on the Andes and Central America, respectively. Zones of potentially high electrical conductivity range from bending-related faulting near the outer rise, the subduction channel at the tip of the continental plate, the dehydration-hydration cycles in and above the downgoing plate, the assumed melting of the asthenospheric wedge to the rise of melts toward the volcanic arc and the magma chambers beneath the volcano edifices. Further targets include fault zones in the forearc, accommodating tensional stress, as well as hydrothermal and mineral deposits, to mention a few. The following chapters emphasize on a variety of structures along continental margins and show the potential of deep EM in this geodynamic setting.

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© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.Freie Universität Berlin, Fachrichtung GeophysikBerlinGermany

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