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<p>We derive a regional 1-D body-wave attenuation (Q⁻<sup>1</sup>) model for a segment of the Dead Sea Fault System using moderate earthquakes (3.0 ≤ M<sub>W</sub> ≤ 4.5). Q<sub>P</sub> and Q<sub>S</sub> are estimated through spectral modeling of stations within 350&#xa0;km, with corner frequencies independently constrained using the empirical Green’s function method to reduce trade-offs between source and attenuation parameters. Path-averaged <i>Q</i> values increase approximately linearly with epicentral distance up to ~ 150&#xa0;km for both P and S waves, followed by a gradual flattening toward an asymptotic regime. This transition is consistent with increasing mantle path contributions associated with the P<sub>g</sub>–P<sub>n</sub> and S<sub>g</sub>–S<sub>n</sub> phase crossover rather than an abrupt change in intrinsic attenuation properties. Inversion of the distance-dependent trends yields a layered 1-D <i>Q(z)</i> structure that reflects relatively low attenuation in the upper crust and higher effective <i>Q </i>at greater depths. Residual analysis indicates only modest lateral variability, suggesting that large-scale path effects dominate over local site controls within the resolution of this dataset. The resulting attenuation model provides physically consistent parameters for ground-motion simulations and offers a framework for future three-dimensional attenuation studies along the Dead Sea Fault System.</p>

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Determination of depth-dependent body wave attenuation beneath the Dead Sea Fault system

  • 期刊论文

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  • 发表日期：

    2026年3月20日

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  • Nadav Wetzler,
  • Esteban J. Chaves

摘要

We derive a regional 1-D body-wave attenuation (Q⁻1) model for a segment of the Dead Sea Fault System using moderate earthquakes (3.0 ≤ MW ≤ 4.5). QP and QS are estimated through spectral modeling of stations within 350 km, with corner frequencies independently constrained using the empirical Green’s function method to reduce trade-offs between source and attenuation parameters. Path-averaged Q values increase approximately linearly with epicentral distance up to ~ 150 km for both P and S waves, followed by a gradual flattening toward an asymptotic regime. This transition is consistent with increasing mantle path contributions associated with the Pg–Pn and Sg–Sn phase crossover rather than an abrupt change in intrinsic attenuation properties. Inversion of the distance-dependent trends yields a layered 1-D Q(z) structure that reflects relatively low attenuation in the upper crust and higher effective Q at greater depths. Residual analysis indicates only modest lateral variability, suggesting that large-scale path effects dominate over local site controls within the resolution of this dataset. The resulting attenuation model provides physically consistent parameters for ground-motion simulations and offers a framework for future three-dimensional attenuation studies along the Dead Sea Fault System.