Imaging Earth Structure By Stacking Global Seismograms

小行星9315060 本研究是利用全球地震台网的地震图叠加研究地球速度结构的继续。 这些叠加的当前版本已经成功地成像了数十个地震相位，包括来自上地幔不连续面的许多反射。 对这些阶段的分析为520公里深度的不连续性以及410公里和660公里不连续性的地形图提供了新的证据。 这项工作将改进叠加技术，以适应更高和更低的频率数据，并将这些方法应用于IRIS网络的宽带数据。 目标是获得地幔内部不连续结构的改进图，开始在叠加图像上试验自动波形反演技术，并在数据中搜索异常或无法解释的特征。 ***

9315060 Shearer This research is a continuation of the investigation of the velocity structure of the earth by means of stacking seismograms from the global seismic networks. Current versions of these stacks have successfully imaged dozens of seismic phases including many reflections from upper mantle discontinuities. Analyses of these phases have provided new evidence for a discontinuity at 520-km depth and maps of the topography of the 410 and 660-km discontinuities. This work will improve the stacking techniques to accommodate both higher and lower frequency data, and apply these methods to the broadband data from the IRIS network. The goals are to obtain improved maps of the structure of internal discontinuities in the mantle, begin experimenting with automatic waveform inversion techniques on the stacked images, and to search for anomalous or unexplained features in the data. ***