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<p>The present study designs a dynamic centrifugal model test to simulate water-free and water-covered free-field sites with the objective of identifying the main characteristics of seismic motion at sea and evaluating how overlying seawater affects the spatial coherence between any two points during an earthquake. The acceleration time history at various subsurface depths was recorded in response to El Centro seismic waves that were used as input. The coherence function between each point is obtained using a multi-dimensional autoregressive (AR) model. The results show that coherence generally increases with the input acceleration magnitude. The coherence function exhibits a general diminishing tendency with increasing distance. The effect of overlying water weight and the interaction between the water and the soil play an important role in ground motion response. Overall, coherence in the water-covered site is found to be lower than in the water-free site under the same working condition.</p>

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Exploring the coherence function across the soft soil depth in seismic ground motion, based on a multi-dimensional autoregressive model

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Jingyan Lan,
  • Xiangyu Liu,
  • Juan Liu,
  • K. C. Diwakar,
  • Jeevan Rawal,
  • Liangbo Hu

摘要

The present study designs a dynamic centrifugal model test to simulate water-free and water-covered free-field sites with the objective of identifying the main characteristics of seismic motion at sea and evaluating how overlying seawater affects the spatial coherence between any two points during an earthquake. The acceleration time history at various subsurface depths was recorded in response to El Centro seismic waves that were used as input. The coherence function between each point is obtained using a multi-dimensional autoregressive (AR) model. The results show that coherence generally increases with the input acceleration magnitude. The coherence function exhibits a general diminishing tendency with increasing distance. The effect of overlying water weight and the interaction between the water and the soil play an important role in ground motion response. Overall, coherence in the water-covered site is found to be lower than in the water-free site under the same working condition.