Abstract
Elastic waves in the seabed generated by low-frequency noise radiating from ships are known as ship seismic waves and can be used to detect and identify ships. To obtain the propagation characteristics of ship seismic waves, an algorithm for calculating seismic waves at the seafloor is presented based on the staggered-grid finite difference method. The accuracy of the algorithm was tested by comparison with analytical solutions. Numerical simulation of seismic waves generated by a low-frequency point sound source in a typical shallow sea environment was carried out. Using various source frequencies and locations in the numerical simulation, we show that the seismic waves in the near field are composed mostly of transmitted S-waves and interface waves while transmitted P-waves are weak near the seafloor. However, in the far field, the wave components of the seismic wave are mainly normal modes and interface waves, with the latter being relatively strong in the waveforms. As the source frequency decreases, the normal modes become smaller and the interface waves dominate the time series of the seismic waves.
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Supported by the National Natural Science Foundation of China (Nos. 51179195, 51679248) and the National Defense Foundation of China (No. 513030203-02)
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Lu, Z., Zhang, Z. & Gu, J. Modeling of low-frequency seismic waves in a shallow sea using the staggered grid difference method. Chin. J. Ocean. Limnol. 35, 1010–1017 (2017). https://doi.org/10.1007/s00343-017-6026-4
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DOI: https://doi.org/10.1007/s00343-017-6026-4