The northwestern part of the Gulf of Mexico has undergone two episodes of continental rifting and collision and produced structural artifacts that are now buried under many kilometers of sediments, complicating investigations of the region. The deep sedimentary package precludes outcrops and points to a need for the application of seismic techniques, but low rates of seismicity in the region and sparse seismic monitoring limit the utility of traditional seismic methods. We therefore use diverse data to perform two‐dimensional seismic tomography across the dry land portion of the margin. Data are gleaned from teleseismic and regional earthquakes, postcritical SsPmp arrivals, and direct P wave energy identified with seismic interferometry that were recorded by a broadband, three‐component array and partially overlapping short‐period, vertical‐component array. The Pn and postcritical SsPmp phase help constrain the Moho discontinuity, which a previous receiver function study suggested was absent beneath the seaward portion of this transect. A high‐velocity body is observed in the crust at the same location as the Houston Magnetic Anomaly, possibly marking rocks from the Alleghenian continental assembly. The crust thins from NW to SE, indicating that extension occurred mostly to the south of the Ouachita orogeny. Our model indicates that the margin's sediment package reaches a maximum thickness of ~15 km at the coast and becomes unresolvably thin near the Llano Uplift.

中文翻译：

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使用环境噪声地震干涉法和局部和远震地震确定西北墨西哥湾边缘的地壳厚度和莫霍面结构

墨西哥湾的西北部经历了两次大陆性裂谷和碰撞事件，并产生了结构人工制品，这些人工制品现在被掩埋在几公里的沉积物之下，这使该地区的调查复杂化了。深层沉积包裹排除了露头，并指出需要应用地震技术，但是该地区的地震活动率低和稀疏的地震监测限制了传统地震方法的实用性。因此，我们使用不同的数据对边缘的旱地进行二维地震层析成像。数据来自远程地震和区域地震，临界SsPmp到来以及直接P用地震干涉法识别的波能，由宽带三分量阵列和部分重叠的短周期垂直分量阵列记录。Pn和临界后SsPmp阶段有助于约束Moho不连续性，先前的接收器功能研究表明该断面的海面以下不存在这种不连续性。在与休斯顿磁异常相同位置的地壳中观察到一个高速物体，可能标志着阿勒格尼大陆组的岩石。地壳从西北到东南变薄，这表明延伸主要发生在瓦希托造山带的南部。我们的模型表明，边缘的沉积物包裹在海岸达到约15 km的最大厚度，并且在Llano隆起附近变得难以解决。