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MARINE GEOLOGY and GEOPHYSICS

机译：海洋地质与地球物理

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Ocean waves have long been considered to be a source of seismic surface-wave energy for subsurface exploration. We test the utility of ocean-source seismic recording, the sensitivity to array orientation with respect to the shoreline direction, and the equivalence of passive- and active-source data acquired in a near-shore environment. The Kohala peninsula of northwestern Hawaii (Big Island), with its exposure to strong trade winds and prominent rock and soil outcrops along sea cliffs, provides an ideal natural laboratory to study ocean noise as a passive seismic source. The results show that passive-source data recorded from ocean waves over a prominent headland in Kohala produce coherent surface-wave dispersion relationships (phase velocity as a function of frequency) that can be modeled for shear-wave velocity in the shallow subsurface, especially when combined with active-source data. We also demonstrate the dependence of the array orientation on the quality of the dispersion spectra-an array perpendicular to the shoreline produces a more complete frequency range and higher coherency, relative to an array oriented parallel to the shoreline. Previous geophysical investigations of the site, constrained by the geologic outcrop along the adjacent sea cliff, confirm the utility of the shear-wave velocity-depth modeling. Ocean waves can be used for modeling of shear-wave velocity in the upper 10-50 m of the subsurface with a relatively short array, but can be improved by combining active and passive sources and by orienting the array parallel to the direction of ocean-wave propagation.
机译：长期以来，海浪一直被认为是用于地下勘探的地震地表波能量的来源。我们测试了海洋源地震记录的实用性，相对于海岸线方向的阵列方向敏感性以及在近岸环境中获得的被动源和主动源数据的等效性。夏威夷西北部（大岛）的科哈拉半岛（Kohala半岛）暴露于强风和沿海崖的突出岩石和土壤露头，为研究海洋噪声作为被动地震源提供了理想的自然实验室。结果表明，在科哈拉一个突出的岬角上的海浪记录的无源数据产生了相干的面波色散关系（相速度是频率的函数），可以为浅地下的剪切波速度建模，特别是当结合主动源数据。我们还证明了阵列方向对色散频谱质量的依赖性-垂直于海岸线的阵列相对于平行于海岸线的阵列产生了更完整的频率范围和更高的相干性。在沿邻近海崖的地质露头的约束下，该地点先前的地球物理研究证实了剪切波速度-深度模型的实用性。海浪可用于以相对较短的阵列对地下10-50 m内的剪切波速度进行建模，但可以通过组合有源和无源以及将阵列定向为平行于海洋方向来进行改进。波传播。

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    《Oceanographic Literature Review》 |2019年第12期|2642-2684|共43页
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