Heterogeneity, Anisotropy, and Anelasticity in the Lowermost Mantle and Inner Core

9614525本研究旨在通过观测和预报的地震波形与这些构造相互作用，研究地球最下部地幔和地核的非均质性、各向异性和滞弹性。PKIKP前体将在统计描述的最下地幔结构中模拟，并与观测结果进行比较。在这一比较中，将确定一个与PKIKP前兆数据以及与核幔边界相互作用的所有其他宽带波形一致的统一模式。还将研究在测量内核滞弹性时通常发现的散射。这些研究结果将对地球深部地幔的板片循环、羽流形成和化学不均质性的地球动力学模型以及寻找对地球核心中高压铁矿相的制约具有重要意义。***

9614525 Cormier This research is to investigate the heterogeneity, anisotropy, and anelasticity of the earth's lowermost mantle and core by means of observed and predicted seismic waveforms interacting with those structures. PKIKP precursors will be modeled in statistically described structures of the lowermost mantle and compared with observations. In this comparison, a unified model will be determined, consistent with both PKIKP precursor data as well as with all other broadband waveforms interacting with the core-mantle boundary. A study will also be made of the scatter typically found in the measurements of the anelasticity of the inner core. The results of these studies will be important to geodynamic models of slab cycling, plume formation, and chemical heterogeneity of the earth's deep mantle and to the search for constraints on the high pressure mineral phase of iron in the earth's inner core. ***