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Topographic heterogeneity of the core-mantle boundary in subduction zones and its effect on kinematics of main geomagnetic field sources

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Abstract

This work considers the kinematics of the source of the main geomagnetic field (MGF) near the core-mantle boundary under the Caribbean region. This source was selected because (i) its trajectory for the reviewed 110 years crosses this boundary, (ii) the region belongs to the so-called cemeteries of the tectonic plates, and (iii) numerous works have studied the structural heterogeneities of the lower mantle in this region with seismic tomography. Our study of the structural heterogeneities of the lower mantle and the trajectory of the MGF source indicates that the relics of the ancient tectonic plates in this region not only reach the coremantle boundary but could penetrate to the liquid core as well to the depth of 300 km. The “cemeteries” of the tectonic plates span significant areas in size. If the topographic heterogeneities of the core-mantle boundary, which are formed by the relics of the ancient tectonic plates, reach several hundreds of kilometers, then they can significantly affect the kinematics of individual structured flows in the liquid core and, consequently, change the spatial structure of secular MGF variations on the Earth’s surface.

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Authors and Affiliations

  1. Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation, Russian Academy of Sciences, St.-Petersburg Branch Muchnoi per. 2, St.-Petersburg, 191023, Russia

    I. M. Demina

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  1. I. M. Demina
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Correspondence to I. M. Demina.

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Original Russian Text © I.M. Demina, 2014, published in Geomagnetizm i Aeronomiya, 2014, Vol. 54, No. 2, pp. 272–282.

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Demina, I.M. Topographic heterogeneity of the core-mantle boundary in subduction zones and its effect on kinematics of main geomagnetic field sources. Geomagn. Aeron. 54, 253–262 (2014). https://doi.org/10.1134/S0016793214020078

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