The attenuation of seismic waves reflects the elastic nature of the media within which the waves propagate. In this study, we calculate the Coda-Q (Q_c), frequency dependence (η), V_p/V_s and Poisson’s (υ) ratios by using 2621 vertical component seismograms generated by 987 earthquakes recorded by 13 seismic stations in Eastern Anatolia, and creat a 2-D seismic tomographic Q_c model for the region. The obtained model provides significant information for exploring the boundaries of adjacent tectonic units within the upper crust and interpreting their dynamic characteristics. The 2-D Q_c model and the other parameters are consistent with the seismotectonic features of Eastern Anatolia. Highly heterogeneous Q_c values are observed in the study area dividing it into north-south directed bands of low and high attenuation. The highest η values were obtained beneath the northwestern and eastern parts of the study region. Clear, high and low υ values are obtained in the western and eastern parts of the study area, respectively. The spatial variations in the measured parameters are consistent with many geophysical observations including low Pn velocities, efficient Sn blockage, high heat flow, and widespread volcanism. Different upper crustal thicknesses and inhomogeneous stress distribution along the East and North Anatolian Fault Zones may also contribute to the observed heterogeneities.

中文翻译：

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东安纳托利亚下方的上地壳泊松比和尾波衰减

地震波的衰减反映了波在其中传播的介质的弹性。在这项研究中，我们使用安纳托利亚东部13个地震台站记录的987次地震产生的2621个垂直分量地震图，计算了Coda- Q（Q _c），频率依赖性（η），V _p / V _s和泊松比（υ）。 ，并为该区域创建二维地震层析成像Q _c模型。获得的模型为探索上地壳内相邻构造单元的边界并解释其动力特征提供了重要的信息。二维Q _c模型和其他参数与安那托利亚东部的地震构造特征相一致。在研究区域中观察到了高度异质的Q _c值，将其划分为低衰减和高衰减的南北向频带。在研究区域的西北部和东部以下获得最高的η值。清晰，上下波动值分别在研究区域的西部和东部获得。测量参数的空间变化与许多地球物理观测结果一致，包括低Pn速度，有效的Sn阻隔，高热流和广泛的火山作用。沿东安纳托利亚断裂带和北安纳托利亚断裂带的不同的上地壳厚度和不均匀的应力分布也可能有助于观测到的非均质性。