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首页> 外文期刊>Journal of geodynamics >Stress field in the Vanuatu (New Hebrides) Wadati-Benioff zone inferred by inversion of earthquake focal mechanisms: evidence for systematic lateral and vertical variations of principal stresses
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Stress field in the Vanuatu (New Hebrides) Wadati-Benioff zone inferred by inversion of earthquake focal mechanisms: evidence for systematic lateral and vertical variations of principal stresses

机译：通过地震震源机制反演推论瓦努阿图（新赫布里底群岛）瓦达蒂-贝尼诺夫地区的应力场：主应力系统横向和纵向变化的证据

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摘要

We evaluate the stress tensor directions in several depth ranges along the Vanuatu Wadati-Benioff zone by inversion of 550 earthquake Harvard CMT solutions. Our results show that although the strike of the Vanuatu slab varies by over 70℃, the maximum compressive stress σ_1 is, nearly horizontal and slab normal all along the arc in the depth range 0-180 km. The minimum compressive stress σ_3 is down dip in the top 60 km and shows a clear tendency to vary systematically from down dip to strike aligned in the depth range 61-180 km. At depths below 180 km σ_1 rotates clockwise at about 30° in respect to the slab normal, while σ_3 is down dip. The variations of σ_3 direction below 60 km indicate that horizontal stretching of the slab modifies the slab pull force. The universal direction of σ_1 in the range 0-180 km implies that one of the dominant forces at Vanuatu is nearly horizontal and slab normal. In the top 60 km it is most likely related to the plate convergence. The only plausible force of this type at greater depth is the sea anchor force: the viscous resistance to the face-wise motion of the slab relative to the mantle. The change of σ_3 direction from strike aligned to down-dip tension at depth greater than 180 km suggests that the slab pull force may become more prominent with depth.
机译：我们通过反演550个地震哈佛CMT解决方案，评估了瓦努阿图瓦达蒂-贝尼奥夫带沿几个深度范围内的应力张量方向。我们的结果表明，尽管瓦努阿图板的走向变化超过70℃，但最大的压缩应力σ_1在0-180 km的深度范围内沿弧线几乎是水平的，并且板沿法线。最小压缩应力σ_3在顶部60 km处为下倾角，并且表现出明显的趋势，即在61-180 km的深度范围内，从下倾角到走向，系统地变化。在低于180 km的深度处，σ_1相对于平板法线顺时针旋转约30°，而σ_3向下倾斜。 σ_3方向在60 km以下的变化表明，平板的水平拉伸改变了平板的拉力。 σ_1的通用方向在0-180 km范围内，这意味着瓦努阿图的主要作用力之一几乎是水平的，且为平板法线。在最远的60公里处，这很可能与板块收敛有关。这种在更大深度上唯一可能的力是海锚力：对平板相对于地幔的面向运动的粘性阻力。 σ_3方向从走向走向到深度大于180 km的下倾张力的变化表明，平板拉力可能随深度而变得更加明显。

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