Patterns of the Seismic Cycle in the Kuril Island Arc from GPS Observations

Vladimirova, I. S.; Lobkovsky, L. I.; Gabsatarov, Y. V.; Steblov, G. M.; Vasilenko, N. F.; Frolov, D. I.; Prytkov, A. S.

doi:10.1007/s00024-020-02495-z

Cited by 14 publications

(21 citation statements)

References 46 publications

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“…During the postseismic stage of the cycle, relaxation of residual elastic stresses occurs due to quasi-independent displacements of blocks. This behavior of the blockwise structure is clearly identified from the analysis of seismotectonic deformations associated with the largest earthquakes of the early 21st century [61][62][63].…”

Section: Keyboard Model Of Earthquake Generation Under Oblique Subduc...mentioning

confidence: 79%

Features of the Largest Earthquake Seismic Cycles in the Western Part of the Aleutian Subduction Zone

et al. 2022

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We discussed the peculiarities of the seismic cycle in Aleutian subduction zone, characterized by an oblique subduction setting. It was shown that the orientation of the plate convergence vector relative to the subduction zone axis can have a significant impact on the preparation and occurrence of the largest earthquakes in subduction zones. In particular, from the analysis of the seismic activity occurring in the western part of the Aleutian island arc, it was found that the seismic cycles here are shorter than in the eastern part of the arc. It was revealed that the strongest earthquakes, repeating in the same areas of the western part of the Aleutian subduction zone, differ both in magnitude and length of the fault zone. Taking into account the oblique subduction setting, we proposed the keyboard model of the largest megathrust earthquakes generation as a mechanism potentially capable of explaining the reduction in the seismic cycle duration and noticeable differences in the spatial extent and localization of the fault zones of events with similar magnitudes occurring in the same segment of the western half of the Aleutian subduction zone.

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Section: Keyboard Model Of Earthquake Generation Under Oblique Subduc...mentioning

confidence: 79%

Features of the Largest Earthquake Seismic Cycles in the Western Part of the Aleutian Subduction Zone

et al. 2022

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“…The 2006 and 2007 events marked the beginning of a new period in the rupture history of the Kuril-Kamchatka subduction zone and ended the seismic silence in the Central Kuril Islands that lasted almost a century (Baranov et al, 2015;Vladimirova et al, 2020). Despite the proximity of the source zones and the obvious connection between the 2006 and 2007 events, the second earthquake was fundamentally different from the first in its seismic parameters.…”

Section: Methodsmentioning

confidence: 99%

Tsunami Generation Efficiency of the 1994, 2006 and 2007 Kuril Islands Earthquakes

Kulikov

Ivanova

2021

Pure Appl. Geophys.

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generated trans-oceanic tsunamis that were recorded over the entire Pacific Ocean. The tsunami sources had significantly different geometries, which led to different impacts in the near-field and far-field zones. We used numerical models to investigate the source efficiency and resulting wave directivity of the three tsunamis. The tsunami models were validated and calibrated using field survey data from the Central Kuril Islands and deep-ocean bottom pressure records in the North Pacific. Using the full energy flux distribution, we conclude that the source of the 2007 event had the most well-defined energy flux directivity and that the tsunami energy radiation from the 1994 event was the most isotropic. Radiation patterns of each source clearly show the fraction of wave energy radiated into the open ocean, as well as that which penetrated into the Sea of Okhotsk through the Kuril Straits or was captured by the shelf and spread from the source area along the Kuril Ridge. We find a noticeable increase in the period of the leading wave emitted from the end of the elongated tsunami sources compared to the period of the waves formed in the transverse direction. The onshore-directed energy flux is shown to be a key factor controlling tsunami amplitudes at the coast.

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“…In that study the rear part of the island arc was considered as a single structural element not subjected to its own horizontal displacements. According to modern satellite geodetic data [Lobkovsky et al, 2017a[Lobkovsky et al, ,b, 2018Vladimirova et al, 2020] during the seismic events both rear and frontal blocks experience almost instantaneous jump-like displacements. In the postseismic period, a slow straightening of the rear blocks occurs, controlled by the resistance of the underlying asthenospheric layer under conditions of viscous friction at the block's bottom.…”

Section: Models Of Regional Deformations Processesmentioning

confidence: 99%

“…Studying the presented velocity field variations is important due to the occurrence of the largest subduction earthquakes at the continental margin of East Asia: the 2006-2007 Simushir earthquakes (Mw = 8.1 − 8.3) and the 2011 Tohoku earthquake with Mw = 9.0 [Dziewonski et al, 1981;Ekström et al, 2012], that have seriously affected the regional deformation field. Earlier, we have carried out a detailed investigation of the seismic cycles of these earthquakes and their impact on the velocity field at the East Asia's continental margin [Lobkovsky et al, 2017b[Lobkovsky et al, , 2018Vladimirova et al, 2020].…”

Section: Analysis Of the Present-day Movements Of The Earth's Surface...mentioning

confidence: 99%

“…The GNSS data in Kuril and Japan Islands differ significantly from the displacement pattern typical for the entire region and allow us to study the continental margin's response to the process of elastic stresses release occurring in the source of the largest subduction earthquake. Most of the stations of the Kuril network were installed only about six months prior to Simushir events, while the other part, especially near the earthquakes' epicenters, were deployed about six months later [Vladimirova et al, 2020], which made it difficult to estimate the stationary interseismic displacement velocity in the Kuril Islands. Figure 4 show the variations in displacement velocities along the Kuril and Japan Islands (estimated at one-year intervals): prior to Simushir earthquakes Figure 4a one year after the Simushir earthquakes Figure 4b and one year after the Tohoku earthquake Fig- ure 4c.…”

Section: Analysis Of the Present-day Movements Of The Earth's Surface...mentioning

confidence: 99%

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Geodynamic model of the interaction between the continental lithosphere and the active continental margin in East Asia

Lobkovsky¹,

Gabsatarov²,

Алексеев³

et al. 2022

Russian Journal of Earth Sciences

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We propose a concept for a geodynamic model of East Asia, taking into account the mechanism of the interaction between the stable part of the regional continental lithosphere and the active continental margin along the Kuril-Kamchatka and Japan island arcs. The concept involves upper mantle convection combined with keyboard-block mechanism explaining seismic cycle patterns in the active continental margin and provides grounds to resolve the paradoxes of the present-day velocity field observed by satellite geodesy methods. These paradoxes are associated with enormous variation in the velocity field, such as sometimes contradict directions of surface motions in the adjacent portions of the earth’s surface. We propose a model that attribute the observed motion pattern to the superposition of the long-term subduction-driven convection regime beneath the continent causing the ocean-ward lithosphere extension and the shorter-term cyclic motion of seismogenic blocks with alternating directions. The model contributes to the development of the physically-based theoretical concepts of modern plate tectonics and eliminates the contradictions between the observed data and classical plate tectonics in East Asia region.

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Patterns of the Seismic Cycle in the Kuril Island Arc from GPS Observations

Cited by 14 publications

References 46 publications

Features of the Largest Earthquake Seismic Cycles in the Western Part of the Aleutian Subduction Zone

Features of the Largest Earthquake Seismic Cycles in the Western Part of the Aleutian Subduction Zone

Tsunami Generation Efficiency of the 1994, 2006 and 2007 Kuril Islands Earthquakes

Geodynamic model of the interaction between the continental lithosphere and the active continental margin in East Asia

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