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首页> 外文期刊>Journal of structural geology >Strain compatibility and fault linkage in relay zones on normal faults
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Strain compatibility and fault linkage in relay zones on normal faults

机译：正常故障时继电器区域的应变兼容性和故障链接

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摘要

Relay zones on normal faults are unlikely to have tabular geometries as depicted in idealised models. Rotation of a relay ramp between non-parallel and non-planar relay-bounding faults will inevitably lead to strain compatibility problems causing open gaps or overlaps within the relay zone. Linkage of relay-bounding faults does not evolve from a single branch point. Rather, linkage occurs at multiple points along the fault tip lines giving rise to initially discontinuous branch lines. Where linkage occurs along a discontinuous slip-aligned branch line, displacement at different levels within the relay zone is partitioned between variable amounts of ramp rotation and slip across the branch line. The linking fault propagates when strain compatibility can no longer be maintained by continuous deformation processes, such as thickening or thinning of incompetent layers within the relay ramp. Step-like changes in vertical displacement vs. distance (d - x) profiles on horizons containing apparently intact relay ramps are probably indicative of incipient breaching and can be used predict the presence of a slip-aligned branch line in the sub-surface. Despite the complexity of the strain distribution within relay zones, the total vertical displacement across the relay remains geometrically coherent at all levels.
机译：如理想模型中所述，正常断层上的继电器区域不太可能具有表格几何形状。在非平行和非平面的继电器边界故障之间，继电器斜坡的旋转将不可避免地导致应变相容性问题，从而在继电器区域内产生开放的间隙或重叠。继电器边界故障的链接不是从单个分支点发展而来的。而是，沿着断层尖端线的多个点发生链接，从而产生最初不连续的分支线。在沿着不连续的滑移对齐的分支线发生链接的情况下，中继区域内不同级别的位移被分配在可变数量的斜坡旋转和跨分支线的滑移之间。当无法通过连续变形过程（例如，继电器斜坡内不称职的层的变厚或变薄）不再保持应变兼容性时，链接故障就会传播。在包含明显完整的中继坡道的层段上，垂直位移与距离（d-x）轮廓的阶梯状变化可能表明初始破坏，可以用来预测在地下存在滑移对齐的分支线。尽管继电器区域内的应变分布很复杂，但继电器上的总垂直位移在所有水平上都保持几何上一致。

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