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Anomalous Lithospheric Magnetic Field over the Indo-Asian Collision Territory According to CHAMP Satellite Data

  • USE OF SPACE INFORMATION ABOUT THE EARTH STUDYING CATASTROPHIC NATURAL PROCESSES FROM SPACE
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Abstract

The distribution of the lithospheric magnetic anomalies over the territory of the Tibetan Himalayan highlands, the Western and Eastern Himalayan syntaxes, and part of the Hindustan Peninsula, obtained from measurements on the German Earth satellite CHAMP (Challenging Minisatellite Payload) in different years of its mission, is studied. The lithospheric magnetic anomalies maps for the modulus of the full vector Ta and for the horizontal component Xa at different satellite flight levels are presented. The accordance of lithospheric magnetic anomalies maps to the regional geological and tectonic data and regional geophysics is considered. The anomalous magnetic field sign inversion over the northern part of the Indian Plate is explained as a possible effect of mantle heating, the rise of the Curie isotherm, and the loss of the initial magnetization of the earth’s lower crust. A series of split-level maps of magnetic anomalies are compared with each other, and the degree of their similarity is estimated. To illustrate the expediency of separation lithospheric magnetic anomalies directly from satellite measurements and to demonstrate the difference between maps of regional lithospheric and near-surface anomalies, a Ta map was constructed based on the data from the EMAG2 database of the WDMAM model at a 4 km level. The results of the work show that the identified magnetic anomalies over the Indo-Asian collision region are adequately consistent with the existing regional geological, tectonic, and geophysical conditions.

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Funding

This work was carried out as part of the State Task of the Schmidt Institute of Physics of the Earth Geoelectromagnetic Research Center, Russian Academy of Sciences (GEMRC IPE RAS) no. 0144-2019-0021 and supported by the current Russian–Chinese grant of the Russian Foundation for Basic Research (RFBR) no. 21-55-53041.

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Authors and Affiliations

  1. Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation of the Russian Academy of Sciences, 108840, Troitsk, Moscow, Russia

    D. Yu. Abramova

  2. Schmidt Institute of Physics of the Earth, Geoelectromagnetic Research Center, Russian Academy of Sciences, 108840, Troitsk, Moscow, Russia

    L. M. Abramova & I. M. Varentsov

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  1. D. Yu. Abramova
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  2. L. M. Abramova
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  3. I. M. Varentsov
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Correspondence to L. M. Abramova.

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Translated by V. Selikhanovich

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Abramova, D.Y., Abramova, L.M. & Varentsov, I.M. Anomalous Lithospheric Magnetic Field over the Indo-Asian Collision Territory According to CHAMP Satellite Data. Izv. Atmos. Ocean. Phys. 58, 1077–1085 (2022). https://doi.org/10.1134/S000143382209002X

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