The detection and classification of earthquakes in regions previously considered aseismic has led to significant advances in our understanding of anthropogenically induced earthquakes in productive basins. The Eagle Ford of southeastern Texas is one such basin that has seen an increase in earthquakes, and a recent TexNet temporary network was deployed in this region to better detect and locate earthquakes. Here we present new results from a joint inversion of ambient noise‐derived group and phase velocity maps with P to S receiver functions for shear velocity. The first‐order features of this model include a clear velocity contrast parallel to the Ouachita‐Marathon Front and thickening of the low‐velocity upper crust from the northwest toward the Gulf Coast. Secondary features include NE‐SW striking variations in the middle to upper crust, related to isolated uplifts inferred throughout the region, and variations in the presence and thickness of a high‐velocity lower crust. These features are anticorrelated such that the region of high‐velocity upper crust has little lower crust high‐velocity material. The Luling Uplift is identified as one of these features, and we suggest the variations in lower crust structure indicate along‐strike variations in the processes involved in the formation and subsequent breakup of Pangea. This model suggests the United States‐Gulf of Mexico margin morphology is shaped by deformation around the edges of strong blocks and that induced seismicity is focused by these structurally competent features.

中文翻译：

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从环境地震噪声与P到S接收函数的联合反演，德克萨斯州东南部的地壳结构

在以前被认为是抗震地区的地震的检测和分类已导致我们对生产盆地中人为诱发的地震的认识有了重大进展。得克萨斯州东南部的伊格福特（Eagle Ford）就是这样一个盆地，地震增加了，最近在该地区部署了TexNet临时网络，以更好地检测和定位地震。在这里，我们介绍了从环境噪声派生的群和相速度图（P到S）联合反演的新结果接收器的剪切速度功能。该模型的一阶特征包括与Ouachita-Marathon Front平行的清晰速度对比，以及从西北部到墨西哥湾沿岸的低速上地壳的增厚。次要特征包括中上地壳的NE-SW显着变化，与整个区域推断的孤立隆升有关，以及高速下地壳的存在和厚度变化。这些特征是反相关的，因此高速上地壳的区域几乎没有下部地壳的高速材料。卢凌隆起被认为是这些特征之一，我们建议下部地壳结构的变化表明了Pangea的形成和随后破裂所涉及的过程中的走向走向变化。