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<p>In earthquake mechanisms, fault geometry is one of the important characteristics to investigate the aseismic deformation within the Earth’s interior. Fault structures have geometrical variations along the strike and dip-down directions, which may be curved, bent, or variable in shape. Modelling of such non-planar fault geometries is more complicated than a planar fault. Here, we have developed a 2-D analytical model framework of an infinite, non-planar, strike-slip fault in the lithosphere-asthenosphere region. The model has been considered in a viscoelastic half-space of standard linear solid (SLS) material. The primary aim is to determine the displacement of the Earth’s surface due to non-planar fault movement and the variation of stress–strain near the fault plane using suitable mathematical methods, including integral transforms, the correspondence principle, and the modified Green’s function technique. The study suggests how geometric irregularity influences the stress–strain components at Earth’s surface in both cases when the fault tip is buried and when it is surface-cutting. Moreover, the results show that variation of creep velocity across the fault plane influences the displacement, stress, and strain patterns. This provides a more realistic representation of natural fault deformation and stress redistribution. These findings may be useful for studying the effects of subsurface deformation due to fault movement.</p>

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Viscoelastic Deformation Analysis of a Non-planar Strike-Slip Fault in Standard Linear Solid

  • 期刊论文

  • 发表日期：

    2026年6月17日

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  • Tanushree Biswas,
  • Seema Sarkar Mondal,
  • Subhash Chandra Mondal

摘要

In earthquake mechanisms, fault geometry is one of the important characteristics to investigate the aseismic deformation within the Earth’s interior. Fault structures have geometrical variations along the strike and dip-down directions, which may be curved, bent, or variable in shape. Modelling of such non-planar fault geometries is more complicated than a planar fault. Here, we have developed a 2-D analytical model framework of an infinite, non-planar, strike-slip fault in the lithosphere-asthenosphere region. The model has been considered in a viscoelastic half-space of standard linear solid (SLS) material. The primary aim is to determine the displacement of the Earth’s surface due to non-planar fault movement and the variation of stress–strain near the fault plane using suitable mathematical methods, including integral transforms, the correspondence principle, and the modified Green’s function technique. The study suggests how geometric irregularity influences the stress–strain components at Earth’s surface in both cases when the fault tip is buried and when it is surface-cutting. Moreover, the results show that variation of creep velocity across the fault plane influences the displacement, stress, and strain patterns. This provides a more realistic representation of natural fault deformation and stress redistribution. These findings may be useful for studying the effects of subsurface deformation due to fault movement.