Free Oscillations and Large-Scale Lateral Heterogeneity of the Earth

本研究旨在为进一步发展 从长周期地震数据确定三维地球结构。 下一个主要的进步将是反转一个数据集， 更大的数量级，50，000个源-接收器的数量级 将在其他地方开发的双。 请注意 专注于各种测量的准确性和可能的偏差， 将不得不采用的近似和技术， 如此大规模的研究。 要讨论的具体专题是 合成长周期地震记录的精确计算， 评估近似方法和反演技术，以及 几何光学、各向异性和 玻恩近似

This research is to develop further the theoretical basis for determining 3-D earth structure from long-period seismic data. The next major advance will be to invert a dataset that is an order of magnitude larger, of the order of 50,000 source-receiver pairs which will be developed elsewhere. Attention here will be focused on the accuracy and possible biases of the various approximations and techniques that will have to be employed in such a large-scale study. Specific topics to be addressed are the accurate computation of synthetic long-period seismograms, evaluation of approximate methods and inversion techniques, and theoretical studies of geometrical optics, anisotropy, and the Born approximation.