The concept of seismic interferometry embraces the construction of waves traveling between receivers or sources with cross‐correlation techniques. In the present study cross correlations of coda waves are used to measure traveltimes of shear waves between earthquake locations for five event clusters of the 2018 West Bohemia earthquake swarm. With the help of a high‐quality earthquake catalog, I was able to determine the shear wave velocity in the region of the five clusters separately. The shear wave velocities range between 3.5 and 4.2 km/s. The resolution of this novel method is given by the extent of the clusters and better than for a comparable classical tomography. It is suggested to use the method in a tomographic inversion and map the shear wave velocity in the source region with unprecedented resolution. Furthermore, the influence of focal mechanisms and the attenuation properties on the polarity and location of the maxima in the cross‐correlation functions is discussed. The intracluster ratio of P wave to S wave velocity is approximately fixed at 1.68.

中文翻译：

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通过源间干涉法向源区层析成像：2018年西波西米亚群地震的剪切波速度

地震干涉法的概念包括使用互相关技术构造在接收器或震源之间传播的波。在本研究中，使用尾波的互相关来测量2018年西波西米亚地震群的五个事件群在地震位置之间的剪切波传播时间。借助高质量的地震目录，我能够分别确定五个群集区域内的剪切波速度。剪切波速度范围为3.5至4.2 km / s。这种新方法的分辨率由簇的范围决定，并且比可比的经典X线断层扫描要好。建议将该方法用于断层成像反演中，并以前所未有的分辨率绘制源区域中的剪切波速度。此外，讨论了焦点机制和衰减特性对互相关函数中最大值的极性和位置的影响。集群内比率P波到S波的速度大约固定为1.68。