New data on earthquake focal mechanisms in the Laptev Sea region of the Arctic-Asian seismic belt

Середкина, А. И.; Мельникова, В. И.

doi:10.1007/s10950-018-9762-9

Cited by 19 publications

(8 citation statements)

References 52 publications

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“…In contrast to the WSM (Heidbach et al, 2016) and our last studies (Imaeva, Gusev, et al, 2017;Seredkina & Melnikova, 2018), showing a strike-slip regime in the Lena River delta, we avoid calculating a stress tensor there due to a small number and high scattering of earthquake focal mechanisms (Figure 4). Thrust faults and strike-slips along the nodal planes, coinciding in their strikes with major thrusts bordering the Siberian Platform (Drachev & Shkarubo, 2017), are observed.…”

Section: Table 1 Stress Tensor Inversion Resultsmentioning

confidence: 99%

“…Seismic moment tensors in a double-couple approximation and source depths are calculated for 103 earthquakes occurred in East Arctic in 1990-2021 (Figure 1, Table S1) applying the method by Bukchin (1990), described in detail in Lasserre et al (2001) and Filippova et al (2022) and presented in Text S1 of Supporting Information S1. Source parameters for 22 earthquakes, located in the Laptev Sea and its framework, have been determined in our previous studies (Imaeva et al, 2021;Seredkina & Kozmin, 2017;Seredkina & Melnikova, 2018), but, they are also considered as they are essential for stress tensor calculations and discussion.…”

Section: Methodsmentioning

confidence: 99%

“…same method (Imaeva et al, 2021;Seredkina & Kozmin, 2017;Seredkina & Melnikova, 2018). Possible geodynamic insights of the results (both stress tensors and individual focal mechanisms) are discussed.…”

mentioning

confidence: 95%

“…Nevertheless, they differ in dominant tectonic regimes for the Lena River delta and do not allow tracing in detail the transition from extension to compression. It can be caused by a lack of earthquake focal mechanisms, used in all the referred studies, and by ambiguity of mechanisms themselves as it has been mentioned in Avetisov (2000) and Seredkina & Melnikova (2018).…”

Section: Introductionmentioning

confidence: 99%

“…Source parameters are calculated from surface wave amplitude spectra for the first time for 81 seismic events with Mw ≥ 4.2 (1990–2021) (Table S1). We aslo use the data for 22 earthquakes (Mw ≥ 4.2, 1990–2015) considered in our previous studies with the same method (Imaeva et al., 2021; Imaeva, Imaev, et al., 2017; Seredkina & Kozmin, 2017; Seredkina & Melnikova, 2018). Possible geodynamic insights of the results (both stress tensors and individual focal mechanisms) are discussed.…”

Section: Introductionmentioning

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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