Estimating frequency-dependent shear wave velocity in near-surface sediment based on seismic interferometry

[摘要] Near-surface seismic shear wave is a basic tool for seismic investigations. However, its frequency-dependent property is not fully investigated, especially by the in situ observation method. Here, we develop the seismic interferometry with a moving frequency window to process the natural seismic signals recorded by the KiK-net network. It is observed that the phase velocity of the shear wave decreases sharply as the frequency increases in the low-frequency range, and remains constant in the high-frequency range. The observed dispersion phenomenon presents a challenge to existing site effect prediction theories, while also providing an observational reference for understanding how the shear wave propagates in near-surface sediment.Graphical Abstract

[发布日期] 2023-10-05

[关键词] Seismic shear wave;Seismic interferometry;KiK-net;Dispersion;Near-surface sediment