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首页> 外文期刊>Geophysical Research Letters >Imaging crustal structure beneath the southern Appalachians with wavefield migration
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Imaging crustal structure beneath the southern Appalachians with wavefield migration

机译：利用波场偏移对南部阿巴拉契亚山脉以下的地壳结构进行成像

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摘要

To constrain crustal structures in the southern Appalachians and the suture zone with the Gondwanan-affinity Suwannee terrane, we applied the 2-D generalized Radon transform wavefield migration method to the scattered incident P wavefield recorded by the EarthScope Southeastern Suture of the Appalachian Margin Experiment and adjacent Transportable Array stations. We resolve the root of thickened crust beneath the high topography of the Blue Ridge Mountains and estimate its density contrast with the mantle to be only 10420kg/m(3). A weak velocity contrast across the crustal root Moho is observed and may be related to an ongoing crustal delamination event, possibly contributing to local tectonic rejuvenation. Beneath the Suwannee terrane, we confirm prior observations of a gently south-southeastward dipping crustal suture, indicating the terminal collision of Laurentia and Gondwana involved several hundred kilometers of overthrusting.
机译：为了用冈瓦纳亲和素旺尼地层约束阿巴拉契亚南部和缝合带的地壳结构，我们将二维广义Radon变换波场迁移方法应用于由阿巴拉契亚边缘实验的EarthScope东南缝合线记录的散射入射P波场和相邻的可移动阵列站。我们解决了蓝岭山脉高地形下增厚的地壳的根部，并估计其与地幔的密度对比仅为10420kg / m（3）。观察到整个地壳根莫霍面速度差较弱，这可能与正在进行的地壳分层事件有关，可能有助于局部构造复兴。在Suwannee地层之下，我们证实了先前观察到的南北缓缓地壳缝合线的缓和，表明Laurentia和Gondwana的最终碰撞涉及上百公里的超推力。

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