Quasi-static analysis of strike fault growth in layered media
Quasi-static analysis of strike fault growth in layered media
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DOI：
10.1111/j.1365-246x.2008.03728.x
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发表时间：
2008-04
影响因子：
2.8
通讯作者：
N. Kame;Shuji Saito;K. Oguni
中科院分区：
文献类型：
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作者：
N. Kame;Shuji Saito;K. Oguni
我们研究了构造不均匀性对走滑断层准静态增长的影响。考虑了一个层状介质，由一个自由表面和焊接到下半空间具有不同的弹性属性的上层。Ⅲ型裂纹作为走滑断层的数学模型，在下半空间成核，然后向界面扩展。本文采用新提出的有限元-β法，模拟了层状介质中裂纹扩展受应力分布控制的准统计过程。我们的研究结果表明，沿着平面轨迹穿过界面的柔顺上层有显着的效果，促进/抑制裂纹扩展之前/之后，其扩展到层，反之亦然，刚性的。这就提出了一种可能性，即由于走滑断层作用引起的地表破裂可能被地壳最顶部的存款层所阻止。
SUMMARY We study the effects of structural inhomogeneity on the quasi-static growth of strike-slip faults. A layered medium is considered, made up of an upper layer bounded by a free surface and welded to a lower half-space with different elastic property. Mode III crack is employed as a mathematical model of strike-slip fault, which is nucleated in the lower half-space and then propagates towards the interface. We adopt FEM-β, newly proposed analysis method for failure, to simulate the quasi-statistic crack growth governed by the stress distribution in layered media. Our results show that along planar traces across interfaces a compliant upper layer has significant effects on promoting/suppressing crack growth before/after its extension into the layer and vice versa for a rigid one. This proposes a possibility that surface breaks due to strike-slip faulting could be arrested by deposit layers at the topmost part of the Earth’s crust.