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Abstract

Summary

2D spectral element simulations in the frequency range 0.1–3 Hz were performed on a large-scale model (1200×50 km). Ocean water, sediments, granitic crust and mantle were included. Two seismic arrays were modeled on the continent in order to analyze the wavefield composition on the granitic crust and above a sedimentary basin. Four source locations were tested: ocean surface in deep and shallow water, ocean bottom and continental surface near the array. Finally, the effect of removing the mantle from the simulation was investigated. The deep-water surface source was able to excite a clear Lg phase, which disappeared when the mantle was removed. The Lg phase, in turn, excited the overtones above the sedimentary basin. The Rayleigh fundamental mode was dominant for the other investigated source locations. This might explain the presence of the Lg phase and Rayleigh overtones in the short-period seismic noise, which is probably a signature of shortperiod sources near the surface in deep ocean.

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/content/papers/10.3997/2214-4609.201800067
2018-03-26
2024-04-25

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Origins Of Rayleigh Wave Overtones In Ambient Noise
Conference Proceedings 2018, 1 (2018); https://doi.org/10.3997/2214-4609.201800067
/content/papers/10.3997/2214-4609.201800067
/content/papers/10.3997/2214-4609.201800067
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