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.

利用地震横波分裂测量的地震各向异性研究上地幔变形。不幸的是，这种SKS分裂技术的垂直分辨率很差，因此构造解释是有问题的。电特性调查，如大地电磁测深，是上地幔结构的另一个信息来源。假设通过长周期MT探测获得的电走向（最高电导的方向）与橄榄石a轴的取向相关，则有另一种方法来探测橄榄石的晶体取向，从而探测上地幔中的流动模式。联合解释电性和地震各向异性并不简单。虽然单晶体和各向同性多晶橄榄石聚集体的电学性质已被很好地理解，但还没有关于上地幔变形与由此产生的电学性质之间关系的研究。为了联合收割机将观测到的电性和地震各向异性数据结合起来，在现有的正演数值模拟中应包括电性，以研究地幔变形对电性的影响。