On the Problem of Body Waves Attenuation in the Elbrus Volcanic Area

Собисевич, А. Л.; Zvereva, A. S.; Лиходеев, Д. В.

doi:10.1134/s1028334x19060102

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…The results were r<120km, Qc(f)=90f 0.7 r>120km, Qc (f)=90f 1.0 Thus, the obtained Qc estimates agree with the results of Pavlenko (2008Pavlenko ( , 2016 where Qc(f) isestimated by the code-normalization method. Sobisevich et al (2019) determined Qc for three seismic stations: GUZR, DOMR and NEY (Figure 1). The third station mentioned is located at the North Caucasus Geophysical Observatory (Schmidt Joint Institute of Physics of the Earth, Russian Academy of Sciences), in the vicinity of the Elbrus volcanic edifice, inside the underground facilities of the Baksan Neutrino Observatory (Institute of Nuclear Research, Russian Academy of Sciences).…”

Section: Previous Studies Of Q In the Regionmentioning

confidence: 99%

“…They used earthquakes with epicentral distances up to 300 km, the coda length window for calculating is 40s and lapse time was variable since 2 times S travel time was used. Sobisevich et al (2019) calculated coda Q for 3 seismic stations DOMR, NEY and GUZR two of which we also used. They obtained lower values than observed in the present study.…”

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%

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

confidence: 99%

Regional variation of coda Q in Northwest Caucasus

2023

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Regional variation of coda Q in Northwest Caucasus

Zvereva

Havskov

Габсатарова

2022

Preprint

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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∙f1.02±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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On the Problem of Body Waves Attenuation in the Elbrus Volcanic Area

Cited by 2 publications

References 8 publications

Regional variation of coda Q in Northwest Caucasus

Regional variation of coda Q in Northwest Caucasus

Regional variation of coda Q in Northwest Caucasus

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