Seismicity in the far Arctic areas: Severnaya Zemlya and the Taimyr Peninsula

Morozov, A. N.; Vaganova, N. V.; Konechnaya, Yana V.; Асминг, В. Э.; Dulentsova, Ludmila G.; Evtyugina, Zinaida A.

doi:10.1007/s10950-021-10032-1

Cited by 12 publications

(5 citation statements)

References 20 publications

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“…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). Most likely, the earthquake reflects the extension of the Laptev Sea rift system, but it has a SW‐NE direction, which agrees with a model by Krylov et al.…”

Section: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

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

Filippova,

Melnikova

2023

Tectonics

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“…Большинство землетрясений здесь регистрируется в устьевой части Хатангского залива, в Хатангском грабене, где берет начало Хатангско-Ломоносовская краевая зона континентальных разломов, и на востоке Таймырского полуострова. Фиксируются также слабые события c ML от 0.6 до 2.3 на юге о-ва Октябрьской Революции, предположительно вызванные процессами разрушения крупных ледников [Morozov et al, 2021].…”

Section: Discussionunclassified

Contribution of the Unique Scientific Facilities "Arkhangelsk Seismic Network" to the Russian Arctic Seismicity Study

Antonovskaya

Konechnaya

Vaganova

et al. 2022

Geodin. tektonofiz.

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“…The work (Morozov et al 2021) was the rst regarded the local seismic events recorded by the seismic station "Severnaya Zemlya" (Fig. 1).…”

Section: Study Areamentioning

confidence: 99%

Glacial and seismic events investigation from a single-station record at Severnaya Zemlya archipelago (Arctic region)

Antonovskaya,

Kapustian,

Konechnaya

et al. 2024

J Seismol

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The new permanent seismic station SVZ started working in Arctic (Severnaya Zemlya archipelago, Bolshevik Island), we discuss the rst results of the local seismicity study. We have processed 46 local seismic events for 2017-2022. Data processing using a single seismic sensor is di cult but using waveforms and spectral-temporal analysis of P-, S-and surface waves it is possible to separate shallow earthquakes from glacial events. We distinguish two types of icequakes -glaciers and pulses. An increase in seismic background noise is related to with processes of glacial nature in summertime. Data processing allows to obtain the main peculiarities of local seismicity, i.e., mutual connection of glacial processes and crustal seismicity. We showed the presence of icequakes induced by local crustal events; their epicenters con ned to the ice domes edges. Spatial-temporal sequence and the rate of events migration show that the glacial events are result of the defusing deformations process in the glaciers caused by the impact of shallow. Thousands of pulsed and noise high-frequency micro-oscillations associate with the sea ice sheet or lake ice. The temporal variation of events' number and energy per day correlates with air temperature temporal variations. Moreover, there is a sharp increase in the number of pulses with sharp temperature changes. The greatest activity of this pulsed events is in winter and especially in March, connected with ice surface destruction. In case of a network deployment is not feasible, even a single seismic station allows to get a useful information about the glacial and seismic processes. Article HighlightsUsing a single permanent seismic station in the Severnaya Zemlya archipelago allows to make progress in the investigation of this poorly studied Arctic territory, in particular to get new information about the glacial and seismic processes.Between 2017-2022 we detected 46 seismic events with local magnitude from 0.2 to 4.9, 35 for October Revolution Island and 11 for Bolshevik Island. The seismic station temporarily did not work in 2019 and 2021. Using spectral and polarization analysis we were able to divide these events into two groups as shallow earthquakes and glacier events. Also, we show that October Revolution Island earthquakes induced icequakes in ice domes.We recorded the thousands of visible pulses greater than noise. Their number correlate to the air temperature sharp change and occurs most often in wintertime. The nature of such events is related to sea or lake ice sheet cracking.

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Seismicity in the far Arctic areas: Severnaya Zemlya and the Taimyr Peninsula

Cited by 12 publications

References 20 publications

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

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

Contribution of the Unique Scientific Facilities "Arkhangelsk Seismic Network" to the Russian Arctic Seismicity Study

Glacial and seismic events investigation from a single-station record at Severnaya Zemlya archipelago (Arctic region)

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