Using data from 186 stations belonging to the USArray Transportable Array, a three-dimensional shear wave velocity model for the southeastern United States is constructed for the top 180 km by a joint inversion of receiver functions and Rayleigh wave phase velocity dispersion computed from ambient noise and teleseismic earthquake data. The resulting shear wave velocity model and the crustal thickness and Vp/Vs () measurements show a clear spatial correspondence with major surficial geological features. The distinct low velocities observed in the depth range of 0–25 km beneath the eastern Gulf Coastal Plain reflect the thick layer of unconsolidated or poorly consolidated sediments atop the crystalline crust. The low (1.70–1.74) and slow lowermost crustal velocities observed beneath the eastern Southern Appalachian Mountains (including the Carolina Terrane and Inner Piedmont) relative to the adjacent Blue Ridge Mountains and Valley and Ridge can be interpreted by lower crustal delamination followed by relamination. The Osceola intrusive complex in the central Suwannee Terrane has similar crustal characteristics as the eastern Southern Appalachian Mountains and thus can similarly be attributed to crustal delamination/relamination processes. The Grenville Province and adjacent areas possess relatively high values which can be attributed to mafic intrusion associated with crustal extension in a recently recognized segments of the eastern arm of the Proterozoic Midcontinent Rift.

中文翻译：

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从接收函数和瑞利波色散的联合反演看美国东南部下方的地壳和上地幔结构

利用属于 USArray 可移动阵列的 186 个台站的数据，通过接收器函数和瑞利波相速度频散的联合反演，构建了美国东南部前 180 公里的三维横波速度模型，该模型由环境噪声和远震地震数据。由此产生的横波速度模型和地壳厚度和 Vp/Vs ( ) 测量结果显示出与主要地表地质特征的明显空间对应关系。在东部墨西哥湾沿岸平原下方 0-25 公里深度范围内观察到的明显低速度反映了结晶地壳顶部未固结或固结差的沉积物的厚层。低(1.70-1.74) 和在南阿巴拉契亚山脉东部（包括卡罗莱纳地块和内皮埃蒙特）相对于相邻的蓝岭山脉和山谷和山脊下观察到的最慢的最低地壳速度可以解释为下地壳分层然后再分层。Suwannee Terrane 中部的 Osceola 侵入杂岩与南阿巴拉契亚山脉东部具有相似的地壳特征，因此可以类似地归因于地壳分层/重新分层过程。格伦维尔省和邻近地区具有相对较高的值，这可归因于与最近确认的元古代中大陆裂谷东臂段的地壳伸展相关的基性侵入。