Anisotropy and the Structural Geology of the Tectosphere

9805206帕克本研究涉及地球大陆地壳和上地幔的地震各向异性绘图。 在地壳和上地幔中，地震各向异性可以由优选的矿物取向和对比岩石类型的精细分层引起。 在地壳中，对齐的裂缝也经常存在各向异性，特别是在上面几公里。 各向异性的强度、各向异性随深度的分布、各向异性与板块运动的关系以及地幔与地壳变形的关系是我们理解大陆形成机制和地球历史的关键。 这项工作将结合联合收割机两个互补的体波技术：剪切波分裂，并在P-尾波的P-SH转换。 大陆是板块构造引擎持续时间最长的地表残留物，也是该引擎在中生代之前活动的主要记录。 通过描述地球大陆区域地震各向异性的模式，这项研究将调查过程动力学的记录。

9805206ParkThis research deals with the mapping of seismic anisotropy in the continental crust and upper mantle of the Earth. In both the crust and upper mantle, seismic anisotropy can arise from preferred mineral orientations and fine layering of contrasting rock types. In the crust, anisotropy from aligned cracks is also often present, especially in the upper few km. The strength of anisotropy, its distribution with depth, its relation to plate motion, and the relation between mantle and crustal deformation are pivotal for our understanding of the mechanisms of continental formation and Earth history. This work will combine two complementary body-wave techniques: shear-wave splitting, and P-SH conversions in the P-coda. Continents are the longest-lasting surface remnants of the plate-tectonic engine, and also the principal record of this engine's activity prior to the Mesozoic. By characterizing the patterns of seismic anisotropy in the continental regions of the Earth, this research will investigate the record of process dynamics.