Seismic Anisotropy in the Lower Mantle: Systematics, Modeling and Interpretation

9814554 Garnero这项研究是对核-地幔边界(CMB)区域(称为D“)上方地球区域调查的继续。这些研究包括：识别/绘制太平洋之下非均质性的中小尺度强横向变化；绘制可变的D”不连续结构和地震波速度各向异性图；在CMB发现可变的(5-40公里)超低速(10%慢)层；以及探测最外层的地震结构。这个项目将越来越详细地研究D“各向异性的系统学。除了记录D”横穿横波的旅行时间分裂的模式外，还有令人信服的证据证明波形不规则的地理系统学。这些特征将被绘制出来，并与阿拉斯加、北太平洋、加勒比海、欧亚大陆和印度/印度洋之下采样充分的D“地区的下地幔非均质性有关。目标之一是更好地了解俯冲板块可能与D”各向异性和结构的关系。

9814554GarneroThis research is a continuation of investigations of the region of the earth just above the core-mantle boundary (CMB) region known as D". These include: identifying/mapping out small to medium-scale strong lateral variations in heterogeneity beneath the Pacific; mapping variable D" discontinuity structure and seismic wave speed anisotropy; discovering a variable thin (5-40 km) ultra-low velocity (10% slow) layer at the CMB; and probing seismic structure of the outermost core. This project will address in increasing detail the systematics of D" anisotropy. In addition to documenting patterns in travel time splits of D" traversing shear waves, there is compelling evidence for geographical systematics in waveform irregularities. These features will be mapped and related to lower mantle heterogeneity for the well-sampled D" regions beneath Alaska, the northern Pacific, the Caribbean, Eurasia, and India/Indian Ocean. One of the goals is to better understand the relationship that subducting slabs may have with D" anisotropy and structure.