Crustal attenuation structures obtained at high frequencies (>1 Hz) are important for seismic risk assessment and geodynamics studies in stable continents. However, it is difficult to infer attenuation in low seismicity regions using body and surface waves. In this study, we explore the potential of using seismic T phases to constrain the crustal attenuation. We analyzed the characteristics of T waves recorded on the seismic array deployed in southern Africa. The converted station-side T-P and T-S phases were identified by analyzing the waveform, travel time, polarization, and frequency-wavenumber features. The distinct differences in polarization and slowness are used to quantify contributions from T-P and T-S conversions. The inverted frequency-dependent Qp and Qs (attenuation factor of local P and S waves, respectively) in the southern Africa are found to be and , respectively. Our method could be extended to infer crustal attenuation features near the coasts of other continents.

中文翻译：

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用地震 T 波确定南部非洲的地壳衰减

在高频（> 1 Hz）下获得的地壳衰减结构对于稳定大陆的地震风险评估和地球动力学研究很重要。然而，很难使用体波和面波来推断低地震活动区的衰减。在这项研究中，我们探索了使用地震T相来限制地壳衰减的潜力。我们分析了部署在南部非洲的地震阵列上记录的T波特征。通过分析波形、走时、极化和频率波数特征，识别转换后的站侧TP和TS相位。极化和慢度的明显差异用于量化来自TP和TS转换。发现南部非洲的反相频率相关Qp和Qs（分别为局部P波和S波的衰减因子）分别为和。我们的方法可以扩展到推断其他大陆海岸附近的地壳衰减特征。