Seismotectonic Position of the Source of the July 13, 2023, Earthquake in the Eastern Laptev Sea Shelf from Surface Wave Data

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In this study, we consider in detail the July 13, 2023, earthquake occurred of the shelf of the eastern Laptev Sea (Belkov–Svyatoi Nos rift). On the one hand, our interest in this event is due to the location of its epicenter, to the east of which there is a sharp decrease in seismic activity. Conversely, detailed Common Depth Point (CDP) data on the structure o the upper crust are available for its epicentral zone, making it possible to analyze the seismotectonic position of the earthquake source. Focal parameters in the instantaneous point source approximation are calculated from surface waves recorded at teleseismic distances. As a result, we have obtained a scalar seismic moment (M0 = 9.8*1016 N · m), corresponding moment magnitude (Mw = 5.3), source depth (h = 8 км), and focal mechanism (a normal fault along a gently dipping nodal plane with a NW–SE strike). Our results are compared with data from seismological agencies. It has been shown that differences between them are most likely caused by various initial data, including their different frequency ranges. Our estimates agree better with the available geological and geophysical information on the tectonics of the study area. Taking into account the data on strike, dip, and penetration depth of faults and our source parameter values, we have concluded that the July 13, 2023, earthquake could have been associated with a major listric normal fault on the western slope of the Belkov–Svyatoi Nos rift.

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Sobre autores

A. Filippova

Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation of the Russian Academy of Sciences; Institute of Earthquake Prediction Theory and Mathematical Geophysics of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: aleirk@mail.ru
Rússia, Moscow, Troitsk, 108840; Moscow, 117997

A. Fomochkina

Institute of Earthquake Prediction Theory and Mathematical Geophysics of the Russian Academy of Sciences; Gubkin National University of Oil and Gas

Email: aleirk@mail.ru
Rússia, Moscow, 117997; Moscow, 119991

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2. Fig. 1. Study region. Epicentres of earthquakes with M ≥ 4.0 (1960-2023) are given according to ISC catalogue [International..., 2024], the earthquake 13.07.2023 with Mw = 5.0 is marked in pink colour [Global..., 2024]. Active faults are marked with red curves according to [Zelenin et al., 2022], Khatangsko-Lomonosov fault zone - with bold dotted line according to [Shipilov et al., 2021]. Stress tensors for the Eurasian basin (Gakkel Ridge) and the shelf of the Laptev Sea are shown according to [Filippova and Melnikova, 2023]: Shmin and SHmah - minimum and maximum horizontal compression, respectively, SV - vertical stress. Letters in circles indicate rifts: A - Anisinsky, B - Belkovsko-Svyatonossky, L - Lyakhovsky, U - Ust-Lensky, F - Faddeevsky [Drachev, 2000; Imaeva et al., 2017]. Hereinafter, topography and bathymetry are shown according to the global model ETOPO 2022 [ETOPO..., 2024]. The thin dashed line highlights the area shown in Fig. 7а. The inset indicates the position of the study region in the Arctic, lithospheric plate boundaries are shown schematically according to [Bird, 2003]. Translated with www.DeepL.com/Translator (free version)

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3. Fig. 2. Example of SWAN processing of the vertical component of the CMB station (azm = 66.09°, Δ = 6330 km): (a) and (b) - SWAN diagrams of the original and filtered signal, respectively (the dispersion curve of the group velocity is shown in white); (c) - the original record (blue curve) and the result of its filtering (red curve).

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4. Fig. 3. Seismic stations at which surface wave spectra were obtained. The station codes correspond to the international standard. LHZ - vertical component of the record, LHT - transversal component of the record (the result of rotation of the horizontal components pointing east and north).

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5. Fig. 4. Focal parameters of the earthquake 13.07.2023 in instantaneous point source approximation calculated from amplitude spectra of surface waves in different ranges of periods (T, c), and their corresponding values of normalised incoherence function ε. Hereinafter, the stereograms of the source mechanisms are given in the projection of the lower hemisphere. Parameters of nodal planes (NP) for focal mechanism No. 1 and T = 50-120 s: NP1 - strike azimuth = 306°, dip angle = 11°, slip angle = -153°; NP2 - strike = 190°, dip = 85°, slip = -80°.

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6. Fig. 5. Focal parameters of the earthquake 13.07.2023 in accordance with data from seismological agencies. Focal mechanism is given for the best double-couple dipole characterising the full deviatoric tensor of seismic moment. Decoding of agency codes: GCMT - The Global CMT Project, Lamont Doherty Earth Observatory, Columbia University, USA (https://www.globalcmt.org); GFZ - German Research Centre for Geosciences, Helmholtz Centre Potsdam, Germany (https://www.gfz-potsdam.de); AUST - Geoscience Australia, Australia (http://www.ga.gov.au). The index f denotes a fixed depth value; DC is the percentage of the shear component (double-couple) in the deviatoric seismic moment tensor.

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7. Fig. 6. Dependence of the partial function of the normalised incoherence ɛh on the source depth (h, km) for the period range 50-120 s.

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8. Fig. 7. Position (a) and northeastern fragment of the interpreted LARGE 89010 DOM profile (b) according to [Drachev, 2000; Drachev et al., 1998] with simplifications. AA′ (blue line) - northeastern part of the LARGE 89010 profile, red lines - active faults according to [Zelenin et al., 2022]. Rift designations (letters in circles) see in the caption to Fig. 1. Panel (a) shows the solution of the focal mechanism of the earthquake 13.07.2023 in the projection of the lower hemisphere (No. 1 for T = 50-120 c in Fig. 4).

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