Abstract
For northeastern Eurasia (60°–70° N, 90°–180° E), the bottom depth of the lithospheric magnetoactive layer is estimated using the centroid method based on two-dimensional spectral analysis of the lithospheric magnetic field. The lithospheric magnetic field within the study region is described by the EMAG2v3 global model. The results show that maximum values (>50 km) of the depth to the bottom of lithospheric magnetic sources are observed almost everywhere under the Siberian Platform north of 65° N. Minimum depth values (<30 km) are traced under the Koryak–Kamchatka fold belt and the Okhotsk–Chukotka volcanic belt. Under the Verkhoyansk–Kolyma fold belt, different maxima (up to 44 km) and minima (up to 30 km) of the bottom depth are seen. Assuming that magnetite is a main magnetic mineral in the continental lithosphere, our distribution of the bottom depth indicates eastward lithospheric heating, from the Siberian Platform to the Koryak–Kamchatka fold belt. The revealed tendency is confirmed by independent geophysical data. Comparison of the results with the distribution of epicenters of regional earthquakes (M ≥ 4.0, 1962–2020) shows that most sources of strong earthquakes (M ≥ 6.0) recorded during the instrumental period of observation, are confined to zones in which a sharp change in depth to the bottom of lithospheric magnetic sources occurs.
DATA AVAILABILITY
The resulting depth distribution of the bottom boundary of lithospheric magnetic sources is available upon request at aleirk@mail.ru.
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Filippova, A.I., Filippov, S.V. Depth to the Bottom of Lithospheric Magnetic Sources Beneath Northeastern Eurasia: Lithospheric Thermal Regime and Relation to Seismicity. Geomagn. Aeron. 64, 128–137 (2024). https://doi.org/10.1134/S0016793223600790
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DOI: https://doi.org/10.1134/S0016793223600790