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Regional variation of coda Q in Northwest Caucasus

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Abstract

Coda Q has been studied in the Northwest Caucasus region using 267 earthquakes and 17 stations from the network of the Geophysical Survey, Russian Academy of Sciences. This is the first Qc study for the region using such a large dataset. The average frequency-dependent coda Q relationship is \(Q_c\;=\;90\;\pm\;21\cdot f^{1.02\pm0.11}\) . This value compares closely to other similar tectonic areas in the world where the same processing parameter had been used. Three specific zones, two in the Greater Caucasus tectonic area and one east of the Ciscaucasian trough area, were studied separately. There was a clear difference in Qc between the zones, particularly for the Ciscaucasian trough area which shows a higher Qc than the 2 other zones. However, the difference between the zones became smaller when using long lapse times tending to give a constant Qc as a function of lapse time. For a longer lapse time, it is assumed that a large part of the coda waves passes the mantle. The 2 zones in Greater Caucasus now had a similar Qc while the East zone in the Ciscaucasian trough still gave the highest values. We contribute this difference to differences in attenuation in the mantle under the two tectonic areas. In our area, there is then a clear difference in Qc for the 3 study areas in the crust but in the mantle the difference is mainly between the two tectonic zones.

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Data availability

The data for the 267 earthquakes used in this study is available at https://www.geo.uib.no/seismo/REPORTS/CODAQ-CAUCASUS. The SEISAN software used for processing is found at seisan.info.

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Funding

The work was supported by the Ministry of Science and Higher Education of the Russian Federation. The data used in the work were obtained with large-scale research facilities “Seismic infrasound array for monitoring Arctic cryolitozone and continuous seismic monitoring of the Russian Federation, neighboring territories and the world”.

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Contributions

A.Z. conceived of the presented idea. A.Z. performed the numerical calculations. A.Z. and J.H. contributed to the interpretation of the results. Both A.Z and J.H. authors contributed to the final version of the manuscript. I.G. was the main consultant on the theoretical part of the tectonics, structure and seismicity of the study area. All authors provided critical feedback and helped shape the research, analysis and manuscript.

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Correspondence to Anastasia S. Zvereva.

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The authors declare no competing interests.

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Highlights

• Detailed attenuation in the form of Coda Q calculated for the Western Caucasus.

• The Western Caucasus has a significant variation in regional attenuation properties.

• Attenuation in the Western Caucasus is comparable to similar tectonic regions in the world.

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Zvereva, A.S., Havskov, J. & Gabsatarova, I.P. Regional variation of coda Q in Northwest Caucasus. J Seismol 27, 363–384 (2023). https://doi.org/10.1007/s10950-023-10154-8

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  • DOI: https://doi.org/10.1007/s10950-023-10154-8

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