Improved Estimates of the Rotation Rate of the Earth's Inner Core

[805245]理查兹这项研究包括努力改进对地心相对于固体地球其余部分的旋转速率的估计。这个项目是原始研究的延续，导致了内核超旋转的发现。在147-155度的临界距离范围内，寻找地球南北自转轴与固体内核内的射线之间夹角小于40度的路径，以寻找更多的地震记录。将在临界距离区域进行另一次地震偶波搜索。双重态具有相同的波型，因此可用于高精度差分走时测量。将进行建模以研究产生观测到的低振幅PKIKP早期到达的结构范围，这些结构与靠近内核快速轴的射线路径有关。

9805245RichardsThis research involves efforts to improve estimates of the inner core's rate of rotation with respect to the rest of the solid Earth. This project is a continuation of the original research that led to the discovery the inner core super rotation. A search will be made for more seismograms in the critical distance range of 147-155 degrees for paths making an angle less than about 40 degrees between the Earth's north-south spin axis and the ray within the solid inner core. Another search will be made for earthquake doublets in the critical distance regions. Doublets have identical wave patterns and can therefore be used to give high-precision differential travel-time measurements. Modeling will be done to investigate the range of structures that produce observed, low-amplitude PKIKP early arrivals associated with ray paths close to the fast axis in the inner core.