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The Experience of Magnetovariational Sounding in the Arctic: the Laptev Sea Region

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Abstract—We present the results of magnetovariational soundings at two sites (Tiksi Observatory and Kotelny Island in the Laptev Sea region of the Arctic) and their three-dimensional (3D) inversion using the ModEM program. In the models obtained by the inversion, the conductive heterogeneities are present in the regions of the both sites down to a depth of 200 km in the region of the observatory and 100 km beneath the Kotelny Island. The geoelectric heterogeneities in the model in the region of the observatory are most contrasting and voluminous, whereas beneath the island they are more localized. The correlation between the locations of these heterogeneities at both sites and the features of the geological and geophysical structure of the region is noted. It is shown that the applied algorithm of data processing eliminates the effect of the polar electrojet which provides the possibility to study the geoelectric structure of the region by magnetovariational method.

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ACKNOWLEDGMENTS

We are grateful to Dr. G. Egbert for providing the possibility to use the ModEM program and to Dr. A. Kelbert for the consultations. We also thank all the creators of websites cited in the paper for providing access to the data.

Funding

The study was carried out under the project no. 18-1-004 of the “Far East” program of the Far Eastern Branch of the Russian Academy of Sciences Branch of the Russian Academy of Sciences and as part of state contract under the program for fundamental research of the Russian Academy of Sciences (item 70, research issue 3).

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Authors and Affiliations

  1. Ilyuchev Pacific Oceanological Institute, Far Eastern Branch, Russian Academy of Sciences, 690041, Vladivostok, Russia

    S. S. Starzhinskii & V. M. Nikiforov

  2. International Center for Space Weather Science and Education, Kyushu University, 819-0395, Fukuoka, Japan

    A. Yoshikawa

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  1. S. S. Starzhinskii
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  2. V. M. Nikiforov
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  3. A. Yoshikawa
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Correspondence to S. S. Starzhinskii.

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Translated by M. Nazarenko

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Starzhinskii, S.S., Nikiforov, V.M. & Yoshikawa, A. The Experience of Magnetovariational Sounding in the Arctic: the Laptev Sea Region. Izv., Phys. Solid Earth 56, 225–237 (2020). https://doi.org/10.1134/S106935132002010X

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