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Communication

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

1
P.P. Shirshov Institute of Oceanology, Russian Academy of Sciences, 117997 Moscow, Russia
2
Moscow Institute of Physics and Technology (MIPT), 141701 Dolgoprudny, Russia
3
Geophysical Survey, Russian Academy of Sciences, 249035 Obninsk, Russia
4
Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, 123242 Moscow, Russia
*
Authors to whom correspondence should be addressed.
Academic Editors: Rosa Nappi and Jesus Martinez-Frias
Geosciences 2022, 12(3), 107; https://doi.org/10.3390/geosciences12030107
Received: 16 October 2021 / Revised: 20 February 2022 / Accepted: 21 February 2022 / Published: 24 February 2022
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. View Full-Text
Keywords: largest earthquakes; oblique subduction; seismic cycles; Aleutian subduction zone; geodynamics; stress accumulation largest earthquakes; oblique subduction; seismic cycles; Aleutian subduction zone; geodynamics; stress accumulation
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MDPI and ACS Style

Lobkovsky, L.I.; Vladimirova, I.S.; Gabsatarov, Y.V.; Alekseev, D.A. Features of the Largest Earthquake Seismic Cycles in the Western Part of the Aleutian Subduction Zone. Geosciences 2022, 12, 107. https://doi.org/10.3390/geosciences12030107

AMA Style

Lobkovsky LI, Vladimirova IS, Gabsatarov YV, Alekseev DA. Features of the Largest Earthquake Seismic Cycles in the Western Part of the Aleutian Subduction Zone. Geosciences. 2022; 12(3):107. https://doi.org/10.3390/geosciences12030107

Chicago/Turabian Style

Lobkovsky, Leopold I., Irina S. Vladimirova, Yurii V. Gabsatarov, and Dmitry A. Alekseev. 2022. "Features of the Largest Earthquake Seismic Cycles in the Western Part of the Aleutian Subduction Zone" Geosciences 12, no. 3: 107. https://doi.org/10.3390/geosciences12030107

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