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

9805245理查兹这项研究包括努力改善内核相对于固体地球其他部分的旋转速率的估计。 该项目是导致发现内核超级旋转的原始研究的延续。 将在147-155度的临界距离范围内寻找更多的地震图，以寻找地球南北自转轴与固体内核内射线之间夹角小于40度的路径。 另一个搜索将在临界距离区域的地震双峰。 双重波具有相同的波型，因此可以用来给出高精度的差分走时测量。 将进行建模，以调查的范围内的结构，产生观察到的，低振幅PKIKP早期到达与射线路径接近内核中的快轴。

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.