Tectono-Geodynamic Settings in the Conjugation Zone of the Lomonosov Ridge, Eurasian Basin, and Eurasian Continental Margin

Шипилов, Э. В.; Lobkovsky, L. I.; Shkarubo, S. I.; Kirillova, Tatiana A.

doi:10.1134/s0016852121050071

Cited by 9 publications

(2 citation statements)

References 38 publications

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“…To the west, the predominance of compression remains, but its orientation is changed by ∼90° relative to the W‐E compression dominating at the eastern peninsula. The rotation of earthquake nodal planes and stress axes, obtained in our study, is consistent with strikes of the main thrust faults at the peninsula (Drachev & Shkarubo, 2017; Shipilov et al., 2021). As the discussed earthquakes are the strongest during the whole period of instrumental observations within the considered regions (Imaeva, Imaev, et al., 2017), we can assume that they characterize the dominating crustal stresses there.…”

Section: Resultssupporting

confidence: 89%

“…The 4 May 1993 earthquake with Mw 4.7 is located between the discussed blocks. Its epicenter is close to the Khatanga‐Lomonosov Fracture, whose width is about 25–30 km there (Shipilov et al., 2021), and its focal mechanism shows right‐lateral strike‐slip motions with a normal fault component along the SW‐NE nodal plane. Nevertheless, the earthquake can not be directly connected with the fracture zone taking into account significant uncertainties in location of Arctic earthquakes (Morozov et al., 2021), caused by evident lack of seismic stations, and the results of geodynamic modeling showing the termination of strike‐slip motions along the Khatanga‐Lomonosov Fracture in the Early Cenozoic (Lobkovsky et al., 2020).…”

Section: Resultsmentioning

confidence: 99%

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Crustal Stresses in the East Arctic Region From New Data on Earthquake Focal Mechanisms

Filippova,

Melnikova

2023

Tectonics

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East Arctic is a key region for understanding the current geodynamic pattern and lithospheric evolution of the whole Arctic. To close an evident gap in regional seismic data, we calculate source parameters for 103 earthquakes (Mw ≥ 4.2, 1990–2021) and compile a representative uniform dataset including source depths, scalar seismic moments, moment magnitudes, and focal mechanisms. On its basis, crustal stresses are estimated within four blocks with the homogeneous stress field. Extension dominates along the Gakkel Ridge and over most of the Laptev Sea shelf. On the continent and east and west of the shelf, it is replaced by compression. The obtained results indicate that the spreading axis of the Gakkel Ridge does not continue to the Laptev Sea shelf and evidence for the Eurasian–North American plate boundary crosses the eastern Laptev Sea shelf and is likely to pass to the Chersky Range through the Yana Bay.

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Section: Resultssupporting

confidence: 89%