利用海底分布式声学传感进行宽带多孔径被动肖尔特波成像
Broadband Multi-Aperture Passive Scholte-Wave Imaging Using Seabed Distributed Acoustic Sensing
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中文总结 AI 辅助
研究利用浅海海洋强迫提供的照明，通过直接处理波场、频率-波数叠加及多孔径策略，实现宽带多孔径被动肖尔特波成像，形成伪二维剪切波速度模型，证明现有海底光纤基础设施可实现宽带区域剪切波成像。
中文摘要 AI 辅助
浅海海洋强迫在德克萨斯湾海岸的海底分布式声学传感电缆沿线提供了强大的宽带被动肖尔特波照明。我们通过对不相关波场的直接处理、长时间频率-波数叠加以及一种多孔径策略来利用这种照明，该策略在解析低频模式的同时保留高频空间定位。恒定波数切片能够在连续阵列中心进行空间一致的多模式跟踪。得到的频散范围约为0.3 - 4.5赫兹，并支持沿51公里电缆段进行400次一维反演。这些剖面形成了一个从近海底到约2公里深度的伪二维剪切波速度模型。宽阔的浅层低速区间与较硬的更新世沉积物中较软的下切谷填充物一致。结果表明，现有的海底光纤基础设施与强大的浅海被动照明相结合，可以实现宽带区域剪切波成像，而更高频率的有源震源对于解析最上层的几米仍然是必要的。
英文摘要
Shallow-water ocean forcing provides strong broadband passive Scholte-wave illumination along a seabed distributed acoustic sensing cable on the Texas Gulf Coast. We exploit this illumination through direct processing of the uncorrelated wavefield, long-duration frequency-wavenumber stacking, and a multi-aperture strategy that preserves high-frequency spatial localization while resolving low-frequency modes. Constant-wavenumber slices enable spatially consistent multimode tracking across successive array centers. The resulting dispersion spans approximately 0.3-4.5 Hz and supports 400 one-dimensional inversions along a 51-km cable segment. These profiles form a pseudo-2D shear-wave velocity model extending from the near seafloor to approximately 2 km depth. Broad shallow low-velocity intervals are consistent with softer incised-valley fill within stiffer Pleistocene deposits. The results demonstrate that existing seabed fiber infrastructure, when coupled with strong shallow-water passive illumination, can deliver broadband regional shear-wave imaging, while higher-frequency active sources remain necessary to resolve the uppermost several meters.
