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Synthetic modelling of acoustical propagation applied to seismic oceanography experiments

机译:声学传播的综合建模在地震海洋学实验中的应用

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Recent work shows that multichannel seismic (MCS) systems provide detailed information on the oceans' finestructure. The aim of this paper is to analyze if high order numerical algorithms are suitable to accurately model the extremely weak wavefield scattered by the oceans' finestructures. For this purpose, we generate synthetic shot records along a coincident seismic and oceanographic profile acquired across a Mediterranean salt lens in the Gulf of Cadiz. We apply a 2D finite-difference time-domain propagation model, together with second-order Complex Frequency Shifted Perfectly Matched Layers at the numerical boundaries, using as reference a realistic sound speed map with the lateral resolution of the seismic data. We show that our numerical propagator creates an acoustical image of the ocean finestructures including the salt lens that reproduces with outstanding detail the real acquired one.
机译:最近的工作表明,多通道地震(MCS)系统可提供有关海洋精细结构的详细信息。本文的目的是分析高阶数值算法是否适合对海洋精细结构散射的极弱波场进行精确建模。为此,我们沿着在加的斯湾的地中海盐晶上采集的一致的地震和海洋剖面生成合成镜头记录。我们将二维有限差分时域传播模型与数字边界处的二阶复杂频移完美匹配层一起应用,以具有地震数据横向分辨率的实际声速图为参考。我们表明,我们的数值传播器创建了包括盐镜在内的海洋精细结构的声学图像,该图像以出色的细节再现了真正的采集图像。

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