Features of Radiation and Propagation of Seismic Waves in the Northern Caucasus: Manifestations in Regional Coda

Kromskii, S. D.; Павленко, О. В.; Габсатарова, И. П.

doi:10.1134/s1069351318020106

Cited by 6 publications

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“…The estimated Qc functions have the form Qc(f)=90•f 0.7 based on data ranging between 30-265 km for the region of ANN station and Qc(f)=55•f 0.9 based on data ranging between 35-290 km for the region of SOC with the average S-wave velocity along the propagation path VS=3.5 km/s. Kromskii et al (2018) used only station ANN to determine Qc by the coda wave decay method. They used 40 earthquakes with Mw >3.9 and epicentral distances r<300 km.…”

Section: Previous Studies Of Q In the Regionmentioning

confidence: 99%

“…It is difficult to compare the results obtained in this study with previous studies in the region since different parameters and programs were used for calculation. We compared our results with those of Pavlenko (2008Pavlenko ( , 2016 and Kromskii et al (2018) for two seismic stations ANN and SOC. Using a geometrical spreading 𝛽 = 1.0 they obtained Q(f)=90•f 0.7 in ANN and Q(f)=55•f 0.9 in SOC.…”

Section: Comparison With Other Regions In the World And Previous Stud...mentioning

confidence: 99%

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Regional variation of coda Q in Northwest Caucasus

2023

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Coda Q has been studied in the North-West 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 Qc=90±21•f 1.02±0.11 . 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 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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Section: Previous Studies Of Q In the Regionmentioning

confidence: 99%