本项目将利用噪声互相关提取台站间的体波震相，以用于研究地幔和地核的精细结构。这种比较新的方法带来的“新”数据是对传统天然地震方法所得数据的一个重要补充，能填补天然地震在空间上和数量上的局限性所带来的“空白”。我们的初步结果显示内核，地幔及上地幔过渡带的体波震相已经能被提取。本项目将致力于解决如下关键问题：1）如何理解这些体波震相与地震，频率等等因素的内在联系，2）如何进一步增加这种方法所得体波震相的信噪比，3）如何利用这些震相研究地球深部结构。

The purpose of this project is to extract body waves from noise correlation between stations and use them to study fine structures of the mantle and the core. The "new" data from this new approach is an important complement to traditional seismic methods, which may fill the "blank" caused by the inherent limitation of big earthquakes (small space and sparse number). Our preliminary results show we are able to extract body waves through the core, the mantle and the mantle transition zone. We will focus on the following key issues: 1) understanding the intrinsic link between these phases and other factors, such as earthquakes, frequency and so on. 2) further increasing the Signal-to-Noise Ratios (SNR) of body phases for this method. 3) using these phases to study the structures of the Earth's interior.