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Seismic Precursors of Large (M ≥ 6.0) Earthquakes in the Junction Zone between the Kuril–Kamchatka and Aleutian Island Arcs

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Abstract

This paper describes the behavior of several seismic precursors prior to the 2016–2019 activation in an area of a complex geodynamic setting at the boundary of the Pacific, North American, and Eurasian plates. We used an integrated approach to combine identified precursors with a view to getting more accurate locations of possible rupture zones of future large earthquakes. The precursors include quiescence based on the RTL parameter and the “Z-function”, variations in the slope of the earthquake recurrence graph (γ-value), and the areas of seismic ruptures dS. For the first time in Kamchatka, we analyze anomalies in the parameter dS interpreted as seismic activations to show the presence of a precursory component before the onset of the foreshock activation. Examples include increases in the values of that parameter before events that were the largest for the areas where they occurred: the Near-Islands Aleutian earthquake of July 17, 2017, Mw = 7.8 and the Uglovoe Podnyatie earthquake of December 20, 2018, Mw = 7.3. The overall extent of the anomalous area, which still exists and includes consecutive quiescence and foreshock phases, is ~900 km, which creates conditions for possible occurrence of a new great earthquake in the junction zone of the three plates with a magnitude that can exceed whatever has been recorded in the region so far.

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Notes

  1. Based on data reported at GCMT: The Global CMT Project (www.globalcmt.org).

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ACKNOWLEDGMENTS

We wish to thank A.D. Zavyalov and N.M. Kravchenko for interest to this research, for a constructive dialogue and helpful comments, as well as being grateful to O.G. Volovich for creating programs for computation of seismicity parameters.

Funding

This work was supported by the Ministry of Education and Science of Russia (for state assignment no. 075-01471-22). We used data acquired at the unique scientific installation (Seismic Infrared Complex for Monitoring of the Arctic Cryolithic Zone and the Complex of Continuous Seismic Monitoring of Russian Federation, Adjacent Territories, and the World) (https://ckp-rf.ru/usu/507436/, http://www.gsras.ru/unu/).

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Correspondence to A. A. Konovalova.

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Konovalova, A.A., Saltykov, V.A. Seismic Precursors of Large (M ≥ 6.0) Earthquakes in the Junction Zone between the Kuril–Kamchatka and Aleutian Island Arcs. J. Volcanolog. Seismol. 17, 491–508 (2023). https://doi.org/10.1134/S0742046323700331

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