Regional variation of coda Q in Northwest Caucasus

IF 1.6 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Journal of Seismology Pub Date : 2023-06-06 DOI:10.1007/s10950-023-10154-8

Anastasia S. Zvereva, Jens Havskov, Irina P. Gabsatarova

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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 Q_c 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 Q_c between the zones, particularly for the Ciscaucasian trough area which shows a higher Q_c than the 2 other zones. However, the difference between the zones became smaller when using long lapse times tending to give a constant Q_c 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 Q_c 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 Q_c 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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西北高加索地区尾波Q的区域差异

摘要利用俄罗斯科学院地球物理调查台网的17个台站和267次地震资料，对西北高加索地区的coda Q进行了研究。这是该地区首次使用如此庞大的数据集进行Qc研究。平均频率相关的尾数Q关系为\(Q_c\;=\;90\;\pm\;21\cdot f^{1.02\pm0.11}\)。这一数值与世界上使用相同处理参数的其他类似构造区非常接近。分别研究了大高加索构造区和顺高加索海槽区以东的三个具体带。区域间Qc有明显差异，特别是高加索槽区，其Qc高于其他2个区域。然而，当使用长时间的移动时，区域之间的差异变得更小，趋向于给出一个常数Qc作为移动时间的函数。在较长的时间内，假设尾波的很大一部分通过地幔。大高加索地区的两个区域现在有了相似的Qc，而中高加索槽的东部区域仍然给出了最高的值。我们将这种差异归因于两个构造区下地幔衰减的差异。在我区，3个研究区在地壳上存在明显的Qc差异，而在地幔上的差异主要存在于两个构造带之间。

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来源期刊

Journal of Seismology 地学-地球化学与地球物理

CiteScore

3.30

自引率

6.20%

发文量

审稿时长

3 months

期刊介绍： Journal of Seismology is an international journal specialising in all observational and theoretical aspects related to earthquake occurrence. Research topics may cover: seismotectonics, seismicity, historical seismicity, seismic source physics, strong ground motion studies, seismic hazard or risk, engineering seismology, physics of fault systems, triggered and induced seismicity, mining seismology, volcano seismology, earthquake prediction, structural investigations ranging from local to regional and global studies with a particular focus on passive experiments.