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Head-wave correlations from ambient noise in a shallow ocean waveguide with a layered seabed

Authors

Li,  Jie
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Siderius,  Martin
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Gerstoft,  Peter
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Fan,  Jun
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Muzi,  Lanfranco
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Li, J., Siderius, M., Gerstoft, P., Fan, J., Muzi, L. (2023): Head-wave correlations from ambient noise in a shallow ocean waveguide with a layered seabed, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1392


Cite as: https://gfzpublic.gfz.de/pubman/item/item_5017209
Abstract
In this study, we derive the travel times and angles of arrival of head-wave correlations from ocean ambient noise in a shallow ocean waveguide with a layered seabed using a vertical line array. The up- and down-going head waves from the same sediment interface are correlated, and their travel time differences give the travel times of head-wave correlations. The angles of arrival of head-wave correlations from different interfaces depend on the sound speeds in the water and seabed layers according to Snell’s law. The head-wave correlations from the water-sediment interface are periodic in time, while those from deeper interfaces show a more complicated time arrival structure. Combining the travel times and angles of arrival of head-wave correlations from different interfaces, it is able to invert for all the sound speeds and layer thicknesses in the water and seabed. The simulation with wind noise and a sediment layer over a half-space seabed verifies the inversion performance.