3-D Mapping of Attenuation in the Upper Mantle

小行星9405927 本研究是利用地震资料研究地幔三维滞弹性结构的继续。 最近的工作与地幔瑞利波导致在上地幔的三维模型Q，这表明，有希望提取有用的信息，地幔的热结构，而不是多余的弹性层析成像结果。 该模型的感兴趣的功能，包括在第一个200公里的深度，以及在过渡区的衰减，与热点强度分布相关的两个最大值与冷却板模型的相关性。 本研究将1）探讨如何将滞弹性层析成像结果作为附加约束纳入地幔动力学模拟中; 2）通过a）包括IRIS/GSN网络快速扩展所提供的新数据、B）增加Love波的约束、c）明确考虑聚焦效应来提高上地幔模型的分辨率;（3）利用体波和简正波资料研究下地幔Q值的横向变化。 ***

9405927 Romanowicz This research is a continuation of investigations of the 3-D anelastic structure of the mantle using seismological data. The recent work with mantle Rayleigh waves has resulted in a 3-D model of Q in the upper mantle, which has demonstrated that there is hope to extract useful information on the mantle's thermal structure, not redundant with elastic tomography results. Features of interest of this model include correlation with cooling plate models in the first 200 km of depth as well as two maxima in attenuation in the transition zone, correlated with hotspot strength distribution. This research will 1) investigate ways in which anelastic tomography results can be incorporated as additional constraints in dynamical modeling of the earth's mantle; 2) improve the resolution of the upper-mantle model by a) including new data available with the rapid expansion of the IRIS/GSN network, b) adding constraints form Love waves, c) taking into account effects of focusing explicitly; and 3) investigate lateral variations of Q in the lower mantle, using both body wave and normal mode data. ***