Depth to the bottom of lithospheric magnetic sources beneath north-eastern Eurasia: lithospheric thermal regime and relation to seismicity

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Abstract

For north-eastern 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 obtained 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 volcanogenic belt. Under the Verkhoyansk-Kolyma fold belt, different maximums (up to 40 km) and minimums (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 evidences for the 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 obtained results with a distribution of epicenters of regional earthquakes (M ≥ 4.0, 1962—2020) shows that most sources of strong earthquakes (M ≥ 6.0), registered during the instrumental period of observation, are confined to zones in which a sharp change in the depth to the bottom of lithospheric magnetic sources occurs.

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A. I. Filippova

Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation of RAS (IZMIRAN)

Author for correspondence.
Email: aleirk@mail.ru
Russian Federation, Moscow, Troitsk

S. V. Filippov

Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation of RAS (IZMIRAN)

Email: sfilip@izmiran.ru
Russian Federation, Moscow, Troitsk

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2. Fig. 1. Area of study. The boundaries of lithospheric plates (black curves) are shown according to [Bird, 2003]. Lithospheric plates (letters in circles): E - Eurasian, O - Sea of Okhotsk, SA - North American. Topography and bathymetry (h - height above sea level) are shown in accordance with the global model ETOPO 2022 [NOAA..., 2022], LV - Linden Basin, PKB - Pre-Verkhoyansk Foredeep.

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3. Fig. 2. Modulus of the total vector of the anomalous geomagnetic field (Ta, nT) at an altitude of 4 km above sea level according to the EMAG2v3 model [Meyer et al., 2017] (a) and the central points of 200 • 200 km blocks within which the calculations of occurrence depths were carried out lithospheric magnetic sources (b). The gray rectangle in Fig. (b) the area we considered earlier in [Filippova et al., 2021] is highlighted. The boundaries of lithospheric plates (black curves) are shown according to [Bird, 2003].

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4. Fig. 3. Depth of the upper boundary of lithospheric magnetic sources (Zt, km), obtained in this work (a), and thickness of the sedimentary layer (N, km) according to the CRUST1.0 model [Laske et al., 2013] (b). The boundaries of lithospheric plates (black curves) are shown according to [Bird, 2003].

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5. Fig. 4. Depth of the lower boundary of lithospheric magnetic sources (Zb, km). The boundaries of lithospheric plates (black curves) are shown according to [Bird, 2003].

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6. Fig. 5. Surface heat flow (q, mW/m2) according to [Fuchs et al., 2021a] (a) and epicenters of regional earthquakes with M ≥ 4.0 recorded in 1962–2020, according to [Gvishiani et al., 2022] (b) in comparison with the obtained depth distribution of the lower boundary of lithospheric magnetic sources (Zb, km). The boundaries of lithospheric plates (black curves) are shown according to [Bird, 2003].

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