Recent studies have shown that crustal body wave phases, such as PmP or SmS, can be effectively retrieved from ambient noise cross-correlations. However, few studies have used these phases to constrain crustal structures. In this study, we successfully retrieve SmS signals from ambient noise data and observe SmS splitting caused by crustal radial anisotropy. Furthermore, through simulations of synthetic tests and application to field data, we demonstrate that these SmS signals can be used to constrain crustal radial anisotropy structures through joint inversion with surface waves. Our findings suggest that SmS signals obtained from noise data can significantly enhance the understanding of fine crustal radial anisotropic structures.

中文翻译：

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环境噪声衍生的 SmS 分裂：一种约束地壳径向各向异性的新方法


最近的研究表明，地壳体波相位，如 PmP 或 SmS，可以有效地从环境噪声互相关中检索。然而，很少有研究使用这些阶段来限制地壳结构。在这项研究中，我们成功地从环境噪声数据中检索了 SmS 信号，并观察到由地壳径向各向异性引起的 SmS 分裂。此外，通过合成测试的模拟和对现场数据的应用，我们证明了这些 SmS 信号可用于通过与表面波的联合反转来约束地壳径向各向异性结构。我们的研究结果表明，从噪声数据中获得的 SmS 信号可以显着增强对细小地壳径向各向异性结构的理解。