Studies of Global Seismicity and Earth Structure

这项研究是所进行调查的5年延续 在两个前赠款处理地震源分析 地球结构。 主题包括1）继续进行中的 质心矩张量（CMT）分析; 2）细化CMT分析 通过波形和走时的组合使用的程序 观察; 3）将CMT程序扩展到分析 利用远震表面波进行较小的事件; 4）使用 SKKS和SKS观测，结合三维地幔模型， 约束外核结构; 5）使用组合数据集， 获得改进的球对称参考地球模型; 6） 对P和S三维速度结构进行联合反演 7）进行基于节理的模拟实验 地震和地球动力学数据的反演，以及探索 三维速度模型的地球动力学含义; 8）包括 三维地球结构建模中的高频数据 实验，以提高径向和横向分辨率; 9） 为混合区域/全球模式制定程序 参数化，这将允许适当的反演大- 尺度区域结构; 10）地幔各向异性研究 和衰减的横向变化以及这些现象如何 在3D建模实验中被考虑。 服务 通过这些努力向世界地震学界提供的信息， 特别是CMT目录，广泛用于确定 地球结构、构造和地震分析。 本研究 是国家地震减灾计划的一部分。

This research is a 5-year continuation of investigations carried out under two former grants dealing with earthquake source analysis and earth structure. Topics include 1) continuation of the ongoing Centroid Moment Tensor (CMT) analysis; 2) refining the CMT analysis procedure through the combined use of waveforms and travel time observations; 3) extending the CMT procedure to the analysis of smaller events by the use of teleseismic surface waves; 4) using SKKS and SKS observations, in conjunction with 3D mantle models, to constrain outer core structure; 5) using combined data sets to obtain improved spherically symmetric reference Earth models; 6) performing joint inversions for the P and S 3D-velocity structure of the mantle; 7) performing modeling experiments based on joint inversion of seismic and geodynamic data, as well as exploring the geodynamic implications of the 3D velocity models; 8) including higher frequency data in the 3D earth structure modeling experiments in order to improve radial and lateral resolution; 9) developing procedures for hybrid region/global model parameterizations which will allow for proper inversions for large- scale regional structure; 10) investigation of mantle anisotropy and lateral variation in attenuation and how these phenomena may be accounted for in the 3D modeling experiments. The service provided by these efforts to the world seismological community, especially the CMT catalog, is widely used in determination of earth structure, tectonics, and earthquake analysis. This research is a component of the National Earthquake Hazard Reduction Program.