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<p>The quantitative relationship and underlying mechanism between earthquake-induced porewater pressure (PWP) changes and ground motion characteristics remains an unresolved issue in earthquake engineering. This study aims to quantify this relationship by analyzing downhole array data from two sites, which includes ground motion measurements and high sampling rate PWP records. Both time-domain and frequency-domain analyses were conducted to characterize PWP oscillation under various shaking conditions. The results revealed a strong correlation between the PWP fluctuation and vertical ground motion in terms of their amplitudes and frequency contents. This is because vertical motions, mainly composed of compression waves, induce instantaneous contraction or dilation in soil. Consequently, two analytical models grounded in wave propagation and poroelastic theory, and validated through field observations, were proposed to estimate peak PWP changes using ground motion parameters.</p>

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Earthquake-induced oscillation of porewater pressure – downhole array observation and theoretical correlation with ground motion

  • 期刊论文

  • 发表日期：

    2025年10月6日

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  • Chi-Chin Tsai,
  • Yu-Ching Kao

摘要

The quantitative relationship and underlying mechanism between earthquake-induced porewater pressure (PWP) changes and ground motion characteristics remains an unresolved issue in earthquake engineering. This study aims to quantify this relationship by analyzing downhole array data from two sites, which includes ground motion measurements and high sampling rate PWP records. Both time-domain and frequency-domain analyses were conducted to characterize PWP oscillation under various shaking conditions. The results revealed a strong correlation between the PWP fluctuation and vertical ground motion in terms of their amplitudes and frequency contents. This is because vertical motions, mainly composed of compression waves, induce instantaneous contraction or dilation in soil. Consequently, two analytical models grounded in wave propagation and poroelastic theory, and validated through field observations, were proposed to estimate peak PWP changes using ground motion parameters.