From orientation to magnitudes in paleostress determinations using fault slip data
From orientation to magnitudes in paleostress determinations using fault slip data
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DOI：
10.1016/0191-8141(89)90034-5
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发表时间：
1989
影响因子：
3.1
通讯作者：
J. Angelier
中科院分区：
文献类型：
--
作者：
J. Angelier
使用断层滑移数据确定约简应力张量可得出主应力轴的方向以及主应力大小之间的差异之比 Φ。使用破裂和摩擦定律可以确定剩下的两个未知数，即重建完整的应力张量。考虑到覆盖层的深度会带来额外的限制。该方法在胡佛水坝遗址（美国西部）的案例中进行了应用和讨论，那里可以获得大量数据集和岩石力学信息。完整样本和岩体特性之间的差异导致了在相似构造环境中确定的古应力水平之间的明显差异。孔隙压力起着重要作用；如果缺少有关孔隙压力的信息，则应将零孔隙压力和静水孔隙压力情况视为限制。
Determinations of reduced stress tensors using fault slip data yield the orientation of principal stress axes and the ratio Φ of the differences between principal stress magnitudes. The use of rupture and friction laws allows determination of the two remaining unknowns, that is, the reconstruction of the complete stress tensor. Taking into account the depth of overburden brings an additional constraint. The method is applied and discussed in the case of the Hoover Dam site (western U.S.A.), where large data sets and rock mechanics information are available. Differences between intact sample and rock mass properties account for apparent disagreements between paleostress levels determined in similar tectonic environments. Pore pressure plays an important role; where information about pore pressure is absent, zero and hydrostatic pore pressure cases should be considered as limits.