Joint quantitative interpretation of electrial and seismic anisotropy: Relation between olivine LPO by solid-state deformation in the upper mantle and the resulting bulk electrical properties

电性和地震各向异性的联合定量解释：上地幔固态变形引起的橄榄石 LPO 与由此产生的体电特性之间的关系

• 批准号: 5401900
• 负责人: Dr. Alexander Gatzemeier
• 金额: --
• 依托单位: Institut für Astrophysik und Geophysik
• 依托单位国家: 德国
• 项目类别: Research Fellowships
• 财政年份: 2003
• 资助国家: 德国
• 起止时间: 2002-12-31 至 2005-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5401900?language=en
• 关键词: Joint; quantitative; interpretation; electrial; seismic

Seismic anisotropy measured by the splitting of teleseismic shear waves is used to investigate the upper mantle deformation. Unfortunately this SKS splitting technique has a poor vertical resolution and therefore tectonic interpretations are open to questions. Electrical properties investigations, such as magnetotelluric (MT) soundings, are another source of information on the upper mantle structure. Assuming that the electrical strike (direction of highest conductance) obtained by long-period MT soundings is correlated with the orientation of the olivine a-axis, there is another method to probe the crystallographic orientation of olivine and, hence, the flow patterns in the upper mantle. By a joint interpretation of electrical and seismic anisotropy is not straightforward. Although the electrical properties of single-crystals and isotropic polycrystalline olivine aggregates are well understood, there has been no work on the relation between deformation in the upper mantle and the resulting electrical properties. To combine observed electrical and seismic anisotropy data electrical properties should be included in existing forward numerical modelling to investigate the effect of mantle deformation on electrical properties.

通过远震剪切波分裂测量的地震各向异性用于研究上地幔变形。不幸的是，这种 SKS 分裂技术的垂直分辨率较差，因此构造解释存在疑问。电特性研究，例如大地电磁（MT）探测，是有关上地幔结构的另一个信息来源。假设长周期大地电磁探测获得的电击（电导最高的方向）与橄榄石a轴的方向相关，那么还有另一种方法可以探测橄榄石的晶体方向，从而探测橄榄石中的流动模式。上地幔。通过联合解释电学和地震各向异性并不简单。尽管单晶和各向同性多晶橄榄石聚集体的电学性质已得到很好的了解，但尚未对上地幔变形与由此产生的电学性质之间的关系进行研究。为了将观测到的电学和地震各向异性数据结合起来，现有的正演数值模拟中应包括电学特性，以研究地幔变形对电学特性的影响。