This study presents a three‐dimensional (3D) model of the crustal and uppermost mantle shear wave velocity and radial anisotropy beneath the Iran Plateau constructed by Rayleigh and Love waves from ambient noise. We correlate three years of continuous seismic ambient noise data recorded in 98 stations to obtain cross correlation functions. Then, we measure Rayleigh (8–60 s) and Love (8–50 s) wave dispersion curves from these cross‐correlation functions to generate two‐dimensional dispersion maps using a fast marching surface tomography method. Finally, we build a quasi‐3D shear wave velocity and radial anisotropy model by jointly inverting Rayleigh and Love local phase velocity dispersion curves using a Bayesian Markov chain Monte Carlo inversion method. Observed radial anisotropy beneath Central Iran is weaker than adjacent areas. Negative radial anisotropy is observed in the shallow structures across our study region, which is most likely attributed to vertically aligned cracks in the upper crust. Strong positive radial anisotropy in the middle to the lower crust beneath the Zagros is imaged, which is associated with ductile shear zones in the crust. Radial anisotropy changes from positive values in the crust to negative values in the upper mantle beneath the Zagros, which may be evidence for the decoupling of the crust from the upper mantle beneath the Zagros.

中文翻译：

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从环境噪声层析成像推断伊朗高原的地壳径向各向异性

这项研究提出了由环境噪声引起的瑞利波和洛夫波构造的伊朗高原下方地壳和最上层地幔剪切波速度以及径向各向异性的三维（3D）模型。我们将在98个站点中记录的连续三年的连续地震环境噪声数据进行关联，以获得互相关函数。然后，我们从这些互相关函数中测量瑞利（8-60 s）和洛夫（8-50 s）的波频散曲线，以使用快速行进表面层析成像方法生成二维频散图。最后，我们通过使用贝叶斯马尔可夫链蒙特卡罗反演方法联合反演瑞利和洛夫局部相速度弥散曲线，建立了准3D剪切波速度和径向各向异性模型。伊朗中部下方观测到的径向各向异性弱于邻近地区。在我们研究区域的浅层结构中观察到负的径向各向异性，这很可能归因于上地壳的垂直排列裂缝。成像了Zagros下下部地壳中部的强正径向各向异性，这与地壳中的韧性剪切带有关。径向各向异性从地壳中的正值变为Zagros之下的上地幔的负值，这可能是地壳与Zagros之下的上地幔解耦的证据。