接收函数方法的研究综述

从远震体波波形数据中提取的P波接收函数和S波接收函数已经成为研究台站下方地壳上地幔速度间断面的最有效的方法之一.P波接收函数已经被广泛应用于获取地壳内部S波速度结构、地壳厚度及物质成分组成、地幔过渡带的厚度变化以及岩石圈地幔的间断面等,而S波接收函数是P波接收函数的一个很好的补充,因为在Moho和地幔过渡带之间的深度范围内,Sp转换波比来自浅部间断面的多次波到达早,而在P波接收函数中,相同深度范围的间断面的Ps转换波往往被来自浅部间断面的多次波干扰或者淹没,因此S波接收函数是目前获取岩石圈地幔深度范围内速度间断面结构(如Moho和LAB)的比较有效的方法,比面波观测具有更高的分辨率.本文详细阐述了P波接收函数和S波接收函数的方法原理以及在地壳上地幔速度间断面的研究中所采用的研究思路.

A review of the receiver function method

The P receiver function method and S receiver function method obtained from the teleseismic body waves have become powerful techniques in detecting the discontinuities in the crust and upper mantle underneath a seismic station. The P receiver function method is widely used in determining the S wave velocity structure of the crust, the thickness and bulk composition of the crust, the variation in the thickness of the mantle transition zone and the discontinuities in the mantle lithosphere. While the S receiver function technique, as an excellent complement for the P receiver function method, can identify the discontinuities of the mantle lithosphere(for example, Moho and LAB) using the higher resolution body waves than surface wave observations, because in the depth interval between Moho and the mantle transition zone, Sp converted phases arrive much earlier than the multiples from the shallow discontinuities, but the Ps converted are often invisible owing to the heavily disturb of multiples. In this paper, we present the application of P receiver function and S receiver function in mapping the discontinuities in the crust and upper mantle and the related research thoughts.