CSEDI Research: Fine Structure of the Lower Mantle

9809771 Gurnis P.I.建议继续进行合作研究，目的是利用地震学和地球动力学的综合方法来了解最低地幔的动力学和精细结构。二维和区域球面地球动力学模型被用来研究(A)强冷板与热化学边界层相互作用的动力学和相变，其中板具有内部岩性分层和(B)粘度变化大、部分熔融和化学非均质性大的上升区。在所有情况下，这些热化学结构都被映射到地震速度场中，从中计算合成波形。动态模型直接对照观测波形、差分走时和层析成像进行测试。

9809771GurnisThe P.I.s propose to continue their collaborative research aimed at understanding the dynamics and fine structure of the lowermost mantle using integrated seismological and geodynamic methodologies. Two dimensional and regional spherical geodynamic models are being used to study the dynamics of (a) strong, cold slabs interacting with thermo-chemical boundary layers and phase changes in which slabs have internal lithologic layering and (b) upwelling regions with large variations in viscosity, partial melting, and chemical heterogeneity. In all cases, these thermo-chemical structures are mapped into seismic velocity fields from which they calculate synthetic waveforms. Dynamic models are directly tested against observed waveforms, differential travel times, and tomography.