The central North China Craton (NCC) acts as a transition zone between the stable western and reworked eastern NCC. It is characterized by high seismic activity and experienced volcanic activity with small magma volumes. To assess the dynamic processes of the central NCC, particularly in a zone marked by intense differential tectonic deformation, we have obtained a 3-D radial anisotropic model of crust and uppermost mantle via joint inversion of Love- and Rayleigh-wave dispersion curves and ellipticity measurements. Compared to models without Rayleigh-wave ellipticity, our new model shows improved accuracy in crustal radial anisotropy. This refined model reveals two noteworthy geological features: (a) Most of the Shanxi Rift has pronounced positive radial anisotropy in the crust except for Linfen and Xinding Basins, as critical earthquake-prone areas, which are characterized by weak positive to negative anisotropy with much thinner sediments. This observation suggests that differential rifting processes with uneven sedimentation and crustal deformation occur in these Cenozoic basins due to right-lateral strike slip motion. (b) The crust in the Lvliang Mountains shows weak positive or negative anisotropy with a lower crustal low-velocity layer beneath the northern parts, whereas the crust in the Taihang Mountains exhibits positive anisotropy. This implies that the Lvliang Mountains experienced uplift under compressional environments since the Yanshanion Orogeny. Furthermore, the magmatic underplating in the crust accelerated the uplift of the northern Lvliang Mountains. In contrast, the Taihang Mountains underwent relative uplift under extensional environments, along with the subsidence of the Bohai Bay Basin during the Cenozoic.

中文翻译：

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地壳和华北中部克拉通下最上部地幔的径向各向异性由表面波色散曲线和椭圆度联合反演：对差异裂谷和隆起机制的影响


华北中部克拉通 （NCC） 是稳定的西部克拉通和重新设计的东部 NCC 之间的过渡带。它的特点是地震活动频繁，火山活动频繁，岩浆体积小。为了评估中央 NCC 的动力学过程，特别是在以强烈微分构造变形为标志的区域，我们通过 Love-wave 和 Rayleigh 波色散曲线和椭圆度测量的联合反演获得了地壳和最上部地幔的三维径向各向异性模型。与没有瑞利波椭圆度的模型相比，我们的新模型在地壳径向各向异性方面显示出更高的精度。该改进模型揭示了两个值得注意的地质特征：（a） 除临汾盆地和新定盆地外，大部分山西裂谷的地壳具有明显的正径向各向异性，是关键的地震易发区，其特征是弱的正向负各向异性，沉积物更薄。这一观察表明，由于右侧走滑运动，这些新生代盆地发生了沉积不均匀和地壳变形的差异裂谷过程。（b） 吕梁山地壳表现出较弱的正或负各向异性，北部下方有较低的地壳低速层，而太行山地壳则表现出正各向异性。这意味着吕梁山自燕山造山运动以来在压缩环境下经历了隆起。此外，地壳中的岩浆底层加速了吕梁山北部的隆升。相比之下，太行山脉在新生代随着渤海湾流域的沉降，在伸展环境中经历了相对隆起。